I have installed communitheme in gnome-shell. It gives smoother and faster experience. However, I am facing the following issue with System Monitor window. The window is completely transparent.
is there any way to solve this in this theme?
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This is already fixed and should land in the stable channel soon: https://github.com/ubuntu/gtk-communitheme/issues/325
Thanks for reporting, best regards
This happens with the calculator and other default apps as well. Default apps are installed in 18.04 through "snap", a new cross-OS package manager. Snap will be much better than APT one day, but right now it's in the beginning stages and experiencing growing pains.
One of these growing pains is that it "themes" each application differently than it has in the past, and some of the new "theming" hasn't had the kinks worked out yet.
Luckily, the workaround is very very easy. Just uninstall with snap and reinstall with APT.
sudo snap remove gnome-system-monitor sudo apt install gnome-system-monitor
You might want to do this with gnome-calculator, too. I'm still looking for other applications that have this issue.
This might help someone in 2020.
sudo snap refresh worked for me. You can try it too. It refreshed all the system apps including the core.
2020-01-17T00:02:42+05:00 INFO Waiting for restart... gnome-system-monitor 3.32.1-3-g0ea89b4922 from Canonical✓ refreshed gtk-common-themes 0.1-28-g1503258 from Canonical✓ refreshed gnome-calculator 3.34.1+git1.d34dc842 from Canonical✓ refreshed core 16-2.42.5 from Canonical✓ refreshed gnome-logs 3.34.0 from Canonical✓ refreshed core18 20200113 from Canonical✓ refreshed gnome-3-28-1804 3.28.0-16-g27c9498.27c9498 from Canonical✓ refreshed gnome-characters v3.32.1+git3.b9120df from Canonical✓ refreshed
All of the apps returned to their normal appearance on Ubuntu 18.04.03 as they are used to be in .deb format.