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
i have the same bug as well, both for system monitor and calculator
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https://bugs.launchpad.net/bugs/1767541
Title:
Transparent background of calculator in