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Before ubuntu 20.04 (at least in 18.04 I am sure) you could change the background for login screen, by editing /etc/alternatives/gdm.css, and changing the url of background image to my favourite file. but there is no such file in 20.04 How could I do this in 20.04?

Masoud Borbor
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  • Oops! That supposed to answer my question but now after using that workaround number 2, I cannot login any more. In fact I see the login page, I enter my password, and I get this: oh no! Something has wrong. A problem has occurred and the system can't recover. Please logout and try again. – Masoud Borbor Jul 02 '20 at 08:49
  • @MasoudBorbor can you press ctrl+alt+f3 or f4 or f5 etc.. and login there?? – PRATAP Jul 02 '20 at 09:05
  • @PRATAP I did, and using tty I installed vanilla gnome (gnome-session gdm3) and I logged in using that – Masoud Borbor Jul 02 '20 at 09:12
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    thats a nice workaround you did.. I am sad if the script made you this problem.. may I know if you remember what coammand you did.. I mean sudo ./focalgdm3 /absolute/path/to/Image or someother.. and did you see success msg on terminal?? – PRATAP Jul 02 '20 at 09:17
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    since you were able to see login page b4 the problem started.. was the background changed as per your choice? – PRATAP Jul 02 '20 at 09:19
  • @PRATAP np. I used this: sudo ./focalgdm3 /absolute/path/to/Image (and I did replace that with my "path to image" :D ) and I saw the success msg, after reboot I saw my favorite picture on Login screen (so it did work, though some fonts were weired and top icons like wifi, etc. was large and black) but unfortunately after I tried to login, I faced that problem – Masoud Borbor Jul 02 '20 at 09:20
  • Ok.. seems there is a problem.. can you log on to tty and run sudo ./focalgdm3 --reset once you see reset successful msg.. reboot and choose default Ubuntu session.. if you would like to continue gnome-session ignore this comment.. – PRATAP Jul 02 '20 at 09:25
  • Have you tried to make any tweakings related to theming with other scripts or something similar b4 doing the workaround 2?? – PRATAP Jul 02 '20 at 09:29
  • @PRATAP I just mafe a backup of /etc/alternatives/gdm3-theme.gresource then tried another script wich was not successful (but after restoring and rebooting everything was fine) and then I tried this one – Masoud Borbor Jul 02 '20 at 09:57
  • @PRATAP before my last workaround (installing vanilla gnome) I tried that ./focalgdm3 --reset option. it said it is successful but the problem was still there. – Masoud Borbor Jul 02 '20 at 09:58
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    Ok seems the backup you took is the keypoint.. I think another script you ran have an option to restore the original one.. if you go through that script you may manually find the correct backup one with ~ symbol.. anyway.. you need the original gresource file now.. I think you can get it by packages ubuntu or some --reinstall command.. once you did it.. the woraround 2 should work for you.. Thanks.. – PRATAP Jul 02 '20 at 10:04
  • the moment you tried other script.. the changes it made are effective to /etc/alternatives/xxx.resource bcoz it is a symbolic file... – PRATAP Jul 02 '20 at 10:07

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