Yes, the source is the problem, this bug occurs in snap version! I've reinstalled the theme using apt and PPA and this problems now longer occur, system monitor and calculator have the default white theme, which is better than having no theme at all
sudo add-apt-repository ppa:communitheme/ppa sudo apt update sudo apt install ubuntu-communitheme-session then reboot and on login screen change the session to communitheme with xorg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1767541 Title: Transparent background of calculator in ubuntu 18.04 using communitheme To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-calculator/+bug/1767541/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
