Go to Preferences and choose Look & Feel
click Change icon theme
from the list choose Papirus
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Install dependencies:
- git
- make
- librsvg2-bin
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Run the following commands as normal user:
git clone https://github.com/PapirusDevelopmentTeam/papirus-calibre-theme.git cd papirus-calibre-theme make build make install
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Start Calibre and enjoy.