typescript-book
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Fixed build problem due to Calibre and Ubuntu 20 problem
Apparently Calibre has a problem with Ubuntu 20: https://bugs.launchpad.net/ubuntu/+source/calibre/+bug/1884295
This problem should be fixed in Calibre, but it seems that apt install calibre-bin
does not fetch this fixed version yet.
So I simply enforce the build to use an elder version of Ubuntu which fixes the problem at the moment.
@basarat @jpilgrim I think this PR can't help and my PR #653 is better