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 Desktop Packages, which is subscribed to gnome-calculator in Ubuntu. https://bugs.launchpad.net/bugs/1767541 Title: Transparent background of calculator in ubuntu 18.04 using communitheme Status in gnome-calculator package in Ubuntu: Confirmed Bug description: It also happen in system monitor ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: gnome-calculator (not installed) ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17 Uname: Linux 4.15.0-20-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: communitheme:ubuntu:GNOME Date: Sat Apr 28 08:34:55 2018 InstallationDate: Installed on 2018-04-27 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_PH.UTF-8 SHELL=/bin/bash SourcePackage: gnome-calculator UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-calculator/+bug/1767541/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
