Ubuntu 16.04 Screen lock suddenly not working
I have two notebooks with Ubuntu 16.04.1/Unity 7.4.0 and few days ago the Lock screen stopped working on both machines. It worked before. The option to lock the screen has disappeared from the menu too. When I press Super+L, only black screen is shown, after mouse moving or any keyboard pressing desktop is back without prompting password.
When I use dm-tool lock from terminal, it shows the Lock screen, but after pressing Ctrl+Alt+F7 I am back to the desktop (without being prompted for a password). I think this maybe started after some update.
I use Ubuntu on my working notebook and I must protect the machine when I leave it.
unity 16.04 lock-screen
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
add a comment |
I have two notebooks with Ubuntu 16.04.1/Unity 7.4.0 and few days ago the Lock screen stopped working on both machines. It worked before. The option to lock the screen has disappeared from the menu too. When I press Super+L, only black screen is shown, after mouse moving or any keyboard pressing desktop is back without prompting password.
When I use dm-tool lock from terminal, it shows the Lock screen, but after pressing Ctrl+Alt+F7 I am back to the desktop (without being prompted for a password). I think this maybe started after some update.
I use Ubuntu on my working notebook and I must protect the machine when I leave it.
unity 16.04 lock-screen
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
add a comment |
I have two notebooks with Ubuntu 16.04.1/Unity 7.4.0 and few days ago the Lock screen stopped working on both machines. It worked before. The option to lock the screen has disappeared from the menu too. When I press Super+L, only black screen is shown, after mouse moving or any keyboard pressing desktop is back without prompting password.
When I use dm-tool lock from terminal, it shows the Lock screen, but after pressing Ctrl+Alt+F7 I am back to the desktop (without being prompted for a password). I think this maybe started after some update.
I use Ubuntu on my working notebook and I must protect the machine when I leave it.
unity 16.04 lock-screen
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
I have two notebooks with Ubuntu 16.04.1/Unity 7.4.0 and few days ago the Lock screen stopped working on both machines. It worked before. The option to lock the screen has disappeared from the menu too. When I press Super+L, only black screen is shown, after mouse moving or any keyboard pressing desktop is back without prompting password.
When I use dm-tool lock from terminal, it shows the Lock screen, but after pressing Ctrl+Alt+F7 I am back to the desktop (without being prompted for a password). I think this maybe started after some update.
I use Ubuntu on my working notebook and I must protect the machine when I leave it.
unity 16.04 lock-screen
unity 16.04 lock-screen
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
edited Nov 10 '16 at 8:53
Zanna
50.6k13135241
50.6k13135241
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
asked Sep 30 '16 at 9:05
BathorySKBathorySK
9117
9117
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
I solved my problem as follows (I found solution in another question):
Install "Unity Tweak Tool" with
sudo apt install unity-tweak-toolI ran it from the Launcher and select System > Security > Enhance system security - Enable Desktop lock.
I don't know what disabled this option. but now it is working OK.
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
add a comment |
You don't need to install 3rd party package
You can re-enable lock screen directly from the terminal.
To see if Lock screen is disabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
add a comment |
I agree with @WinEunuuchs2Unix, you should not need to install 3rd party software to resolve this issue. This issue recently happened to me after upgrading software on my work machine.
I first attempted
gsettings get org.gnome.desktop.lockdown disable-lock-screen
which returned false so I knew that wasn't the issue. Next, I checked the nopasswdlogin line in /etc/group file and saw that my username was added to this. I removed my login name and saved the file. This solved my lock screen problem.
Here is a reference on how to read this file: Understanding /etc/group File
answered Feb 26 '18 at 17:03
JonJon
1807
add a comment |
this solved my problem too; but now the clause has been changed in Unity Tweak Tool as shown below.
It now says: ENHANCE SYSTEM SECURITY BY DISABLING:
So, make sure that everything is unchecked.
answered Mar 24 '17 at 4:10
LoganLogan
317319
add a comment |
I had this problem after upgrading to Ubuntu 18.04. The keyboard shortcut Super-L did not work. The fix was to (re)install the missing package gnome-screensaver:
sudo apt install gnome-screensaver
For the OP with Ubuntu 16.04, (s)he might accidently have lost this package.
answered Jan 12 at 2:40
RolandRoland
1224
add a comment |
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5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
I solved my problem as follows (I found solution in another question):
Install "Unity Tweak Tool" with
sudo apt install unity-tweak-toolI ran it from the Launcher and select System > Security > Enhance system security - Enable Desktop lock.
I don't know what disabled this option. but now it is working OK.
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
add a comment |
I solved my problem as follows (I found solution in another question):
Install "Unity Tweak Tool" with
sudo apt install unity-tweak-toolI ran it from the Launcher and select System > Security > Enhance system security - Enable Desktop lock.
I don't know what disabled this option. but now it is working OK.
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
add a comment |
I solved my problem as follows (I found solution in another question):
Install "Unity Tweak Tool" with
sudo apt install unity-tweak-toolI ran it from the Launcher and select System > Security > Enhance system security - Enable Desktop lock.
I don't know what disabled this option. but now it is working OK.
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
I solved my problem as follows (I found solution in another question):
Install "Unity Tweak Tool" with
sudo apt install unity-tweak-toolI ran it from the Launcher and select System > Security > Enhance system security - Enable Desktop lock.
I don't know what disabled this option. but now it is working OK.
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
edited Nov 10 '16 at 8:49
Zanna
50.6k13135241
50.6k13135241
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
answered Oct 3 '16 at 7:33
BathorySKBathorySK
9117
9117
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
add a comment |
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
I was checked this checkbox suddenly(I mean it was checked) and when I read your answer, disabled it. Now I'm able to lock(just when it remain unchecked)!
– ABS
Dec 2 '17 at 0:36
add a comment |
You don't need to install 3rd party package
You can re-enable lock screen directly from the terminal.
To see if Lock screen is disabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
add a comment |
You don't need to install 3rd party package
You can re-enable lock screen directly from the terminal.
To see if Lock screen is disabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
add a comment |
You don't need to install 3rd party package
You can re-enable lock screen directly from the terminal.
To see if Lock screen is disabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
You don't need to install 3rd party package
You can re-enable lock screen directly from the terminal.
To see if Lock screen is disabled:
gsettings get org.gnome.desktop.lockdown disable-lock-screen
false
If result is true then use:
gsettings set org.gnome.desktop.lockdown disable-lock-screen false
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
answered Jan 27 '18 at 16:59
WinEunuuchs2UnixWinEunuuchs2Unix
45k1082172
45k1082172
add a comment |
add a comment |
I agree with @WinEunuuchs2Unix, you should not need to install 3rd party software to resolve this issue. This issue recently happened to me after upgrading software on my work machine.
I first attempted
gsettings get org.gnome.desktop.lockdown disable-lock-screen
which returned false so I knew that wasn't the issue. Next, I checked the nopasswdlogin line in /etc/group file and saw that my username was added to this. I removed my login name and saved the file. This solved my lock screen problem.
Here is a reference on how to read this file: Understanding /etc/group File
answered Feb 26 '18 at 17:03
JonJon
1807
add a comment |
I agree with @WinEunuuchs2Unix, you should not need to install 3rd party software to resolve this issue. This issue recently happened to me after upgrading software on my work machine.
I first attempted
gsettings get org.gnome.desktop.lockdown disable-lock-screen
which returned false so I knew that wasn't the issue. Next, I checked the nopasswdlogin line in /etc/group file and saw that my username was added to this. I removed my login name and saved the file. This solved my lock screen problem.
Here is a reference on how to read this file: Understanding /etc/group File
answered Feb 26 '18 at 17:03
JonJon
1807
add a comment |
I agree with @WinEunuuchs2Unix, you should not need to install 3rd party software to resolve this issue. This issue recently happened to me after upgrading software on my work machine.
I first attempted
gsettings get org.gnome.desktop.lockdown disable-lock-screen
which returned false so I knew that wasn't the issue. Next, I checked the nopasswdlogin line in /etc/group file and saw that my username was added to this. I removed my login name and saved the file. This solved my lock screen problem.
Here is a reference on how to read this file: Understanding /etc/group File
answered Feb 26 '18 at 17:03
JonJon
1807
I agree with @WinEunuuchs2Unix, you should not need to install 3rd party software to resolve this issue. This issue recently happened to me after upgrading software on my work machine.
I first attempted
gsettings get org.gnome.desktop.lockdown disable-lock-screen
which returned false so I knew that wasn't the issue. Next, I checked the nopasswdlogin line in /etc/group file and saw that my username was added to this. I removed my login name and saved the file. This solved my lock screen problem.
Here is a reference on how to read this file: Understanding /etc/group File
answered Feb 26 '18 at 17:03
JonJon
1807
answered Feb 26 '18 at 17:03
JonJon
1807
answered Feb 26 '18 at 17:03
JonJon
1807
answered Feb 26 '18 at 17:03
JonJon
1807
1807
add a comment |
add a comment |
this solved my problem too; but now the clause has been changed in Unity Tweak Tool as shown below.
It now says: ENHANCE SYSTEM SECURITY BY DISABLING:
So, make sure that everything is unchecked.
answered Mar 24 '17 at 4:10
LoganLogan
317319
add a comment |
this solved my problem too; but now the clause has been changed in Unity Tweak Tool as shown below.
It now says: ENHANCE SYSTEM SECURITY BY DISABLING:
So, make sure that everything is unchecked.
answered Mar 24 '17 at 4:10
LoganLogan
317319
add a comment |
this solved my problem too; but now the clause has been changed in Unity Tweak Tool as shown below.
It now says: ENHANCE SYSTEM SECURITY BY DISABLING:
So, make sure that everything is unchecked.
answered Mar 24 '17 at 4:10
LoganLogan
317319
this solved my problem too; but now the clause has been changed in Unity Tweak Tool as shown below.
It now says: ENHANCE SYSTEM SECURITY BY DISABLING:
So, make sure that everything is unchecked.
answered Mar 24 '17 at 4:10
LoganLogan
317319
answered Mar 24 '17 at 4:10
LoganLogan
317319
answered Mar 24 '17 at 4:10
LoganLogan
317319
answered Mar 24 '17 at 4:10
LoganLogan
317319
317319
add a comment |
add a comment |
I had this problem after upgrading to Ubuntu 18.04. The keyboard shortcut Super-L did not work. The fix was to (re)install the missing package gnome-screensaver:
sudo apt install gnome-screensaver
For the OP with Ubuntu 16.04, (s)he might accidently have lost this package.
answered Jan 12 at 2:40
RolandRoland
1224
add a comment |
I had this problem after upgrading to Ubuntu 18.04. The keyboard shortcut Super-L did not work. The fix was to (re)install the missing package gnome-screensaver:
sudo apt install gnome-screensaver
For the OP with Ubuntu 16.04, (s)he might accidently have lost this package.
answered Jan 12 at 2:40
RolandRoland
1224
add a comment |
I had this problem after upgrading to Ubuntu 18.04. The keyboard shortcut Super-L did not work. The fix was to (re)install the missing package gnome-screensaver:
sudo apt install gnome-screensaver
For the OP with Ubuntu 16.04, (s)he might accidently have lost this package.
answered Jan 12 at 2:40
RolandRoland
1224
I had this problem after upgrading to Ubuntu 18.04. The keyboard shortcut Super-L did not work. The fix was to (re)install the missing package gnome-screensaver:
sudo apt install gnome-screensaver
For the OP with Ubuntu 16.04, (s)he might accidently have lost this package.
answered Jan 12 at 2:40
RolandRoland
1224
answered Jan 12 at 2:40
RolandRoland
1224
answered Jan 12 at 2:40
RolandRoland
1224
answered Jan 12 at 2:40
RolandRoland
1224
1224
add a comment |
add a comment |
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