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Lock screen wallpaper option on Ubuntu 20.04 LTS is not available unlike in 18.04 LTS.

Screen shot

pomsky
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manoj kumar
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    This is by design. Curtain style login screen is no longer available. GNOME 3.36 uses blurred desktop wallpaper as the background of lock screen. Example video by GNOME. – Kulfy Apr 25 '20 at 08:26
  • @Kulfy I chose that metro st. image but still getting old purple color lockscreen after boot. I upgraded from 19.10 . Is there any solution ? – xaif May 13 '20 at 03:18
  • @xaif Is it before starting the user session? If no, consider asking a new question with details and screenshots. Comments are not intended for asking new questions. – Kulfy May 16 '20 at 21:27
  • @Kulfy Sorry, that's unacceptable because it *%$#s up my ultra-dark theme, preventing me from having a fully reverseable white/black background turning both into a solid gray which is TOO bright for dark mode! – Michael Mar 07 '22 at 23:23

2 Answers2

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Ubuntu 20.04 uses the newest version of Gnome 3.36. This version has a new lock-screen now, it doesn't have separated screensaver and login window anymore but the same window for both. Also the new lock screen doesn't display any separated picture now - it blurs a wallpaper you have on your desktop (you can easily check it changing wallpapers and locking your screen). In other words, it's not a bug but absolutely normal behavior. I assume there is or there will be some possibility to change it, perhaps Dconf can help with that but I'm not sure since this is a pretty new feature.

Iván Prokópov
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    https://blogs.gnome.org/shell-dev/2020/02/18/login-and-unlock-in-gnome-shell-3-36/ might explain the thinking behind. – Beernarrd May 02 '20 at 20:02
  • so here's the problem... my background is solid white (or black, if I reverse video for ultra-dark mode), but this blurring turns my white color middle gray and my black color middle gray also, making my lock screen way too bright at night! – Michael Mar 07 '22 at 23:24
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You can have a lock screen wallpaper as you wish with this extension.

Lock screen background

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PRATAP
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    This extension works very well on Ubuntu 20.04 – alx.balmus May 05 '20 at 11:16
  • ugh. again an extension that implying that maybe I need to install something for the browser (not sure, it doesn't seem to be able to tell me for sure) when i really just need a solid white/black background that isn't ruined by the stupid softening effect – Michael Mar 07 '22 at 23:25