After updating from 18.04 to 20.04 my software center become fully transparent.
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Refer https://askubuntu.com/help/on-topic where you'll notice only supported releases of Ubuntu and flavors are on-topic for this site. For focal fossa [20.04] questions you'll need to use a development support site such as IRC (#ubuntu+1) or Ubuntu Forums, or wait until after release for this site (expected release date for Ubuntu 20.04 is late 23rd April 2020 when your question will be on-topic here). – guiverc Apr 23 '20 at 10:24
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This doesn't appear to happen with all externally installed themes - problem should possibly be with the theme becoming incompatible with 20.04. – Martin Medro Apr 28 '20 at 05:10
4 Answers
Change the theme of the application window back to Yaru (bug). For some reason there an issue applying themes the certain windows.
You can try changing the theme. Not all themes have this transparency issue.
You can try installing a different theme from here: https://www.gnome-look.org/browse/cat/135/ord/latest/ (Many of these may have the same issue)
or
You can create your own theme using Oomox: https://www.ostechnix.com/oomox-customize-and-create-your-own-gtk2-gtk3-themes/
(Here is the link to the Oomox theme I created to get rid of this issue: Coffeetose, it may not be the best one though!)
...as a last resort, you can definitely change back to one of the default themes...!
I hope this will solve your problem for now.
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I have an answer to that.
When you install a custom theme which is under root or sudo that are at /usr/local/themes should be moved to /home/$USER/.themes and When you apply your custom theme, All the apps will have your custom theme applied except the software center which will be on default white Yaru theme.
And when the developers update their themes compatible to Ubuntu 20.04, Ubuntu software center will also work flawlessly.
Having the same issue with every theme other than Yaro! On Ubuntu 20.04 all you have to do is install flatpak and the transparency will go away after a reboot. https://www.omgubuntu.co.uk/2019/02/how-to-install-flatpak-on-ubuntu-flathub