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I'm using Ubuntu 20.04 and noticed a weird behavior. When I select a wallpaper image, it is selected for both lock screen and background wallpaper, but on every first boot I see a mysterious image. I don't know where this is displayed from. Is a beach or something. I already checked my images on /home and even removed the wallpaper images from /usr, but the mysterious image is still there. How can I change it?

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  • have you installed anything related to question.. what is the output of the command update-alternatives --config gdm3-theme.gresource
    – PRATAP
    Jul 8, 2020 at 12:12
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    Please, please take a photo of this mysterious beach, add it to the question and satisfy our curiosity!
    – Jos
    Jul 8, 2020 at 12:22
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    @PRATAP, yes, I installed and seems Flat remix is active, as the result: ------------------------------------------------------------ * 0 /usr/share/themes/Flat-Remix-Blue/gnome-shell/gnome-shell-theme.gresource 100 modo automático 1 /usr/share/gnome-shell/gnome-shell-theme.gresource 10 modo manual 2 /usr/share/gnome-shell/theme/Yaru/gnome-shell-theme.gresource 15 modo manual 3 /usr/share/themes/Flat-Remix-Blue/gnome-shell/gnome-shell-theme.gresource 100 modo manual
    – taq
    Jul 9, 2020 at 14:07

1 Answer 1

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your situation is similar to this post Two different login screens on Ubuntu 18.10!

but instead of plain css file, it is using gresource file..

If you want to change the background keeping the Flat-Remix-Blue theme as it is, you need to manually extract the Flat-Remix-Blue's gresource file, edit the background as you wish and compile it back..

you can go through this post to understand the manual way How do I change login screen theme or background in Ubuntu 20.04?


I have gone through the source code of flat-remix https://drasite.com/flat-remix-gnome

The better way is to reinstall the package again after replacing the background image from source and making the blur value to suitable value..

git clone https://github.com/daniruiz/flat-remix-gnome
cd flat-remix-gnome make && sudo make install

enter image description here

PKGNAME = flat-remix-gnome
MAINTAINER = Daniel Ruiz de Alegría <[email protected]>
PREFIX ?= /usr
THEMES ?= $(patsubst %/index.theme,%,$(wildcard */index.theme))
BASE_THEME ?= Flat-Remix-Blue
BLUR ?= 6
IS_UBUNTU ?= $(shell echo "$$(lsb_release -si 2> /dev/null)" | grep -q 'Ubuntu\|Pop' && echo true)

enter image description here

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    JESUSMARYJOSEPH that was it! I reverted it back to Yaru and now that beach image is gone! Thank you so much!
    – taq
    Jul 9, 2020 at 14:47

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