I am facing this issue too. It happened when I tried to lock my screen(Win+L).
I was using Chrome when the issue happened, the system would not respond to the above command initially. I clicked on the screen(the bookmark pop was open) a few times and tried the command again and it finally got locked.
When I tried to unlock my system I saw the terminal for a few seconds before the login screen. This happens everytime when I try to unlock the screen now.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial
I am facing this issue too. It happened when I tried to lock my screen(Win+L).
I was using Chrome when the issue happened, the system would not respond to the above command initially. I clicked on the screen(the bookmark pop was open) a few times and tried the command again and it finally got locked.
When I tried to unlock my system I saw the terminal for a few seconds before the login screen. This happens everytime when I try to unlock the screen now.
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial