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I am using Ubuntu 20.04LTS. When I upgraded my system from Ubuntu 18.xx/19.xx(sorry i don't remember) to Ubuntu 20.04, my screen lock suddenly stopped working.

Earlier when I press Windows(Super) + L, my Ubuntu screen locks and and require password to open but after upgrading it stopped working. And I even tried to lock from right corner from setting option to Lock, that is also not working.

I tried Super+Alt+L, this is also not working. If I do nothing for 15 min than laptop suspand but it does not ask for password when open. I saw my setting and everything was normal. See this picture

I looked on internet and tried every solution but It did not solve my problem. I tried these solution: link1 Link2 Link3 Link4 update: I am using lightdm display manager so when in my terminal when I type dm-tool lock ,it lock the screen and require password to open. I changed my display manager to gdm3 but that also didn't help. Please help. Thank You

John
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    I am facing this problem for more than 10+ months. I was at home so I did not care about lock but Now I go to outside so I asked the solution as this is a problem if not locked outside. @guiverc – John Jun 25 '21 at 06:49
  • Is the shortcut key properly defined in Settings - Keyboard? – vanadium Jun 25 '21 at 14:52
  • @vanadium yes I checked and tried to change also but didnt work – John Jun 26 '21 at 05:33

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