Oh right, the up to date version of Debian is bullseye (did), not buster
(stable).
Buster is indeed distributing an ancient "stable" version of calibre due to
their freeze policy. You'll need to install calibre from the website
instead of from Debian if you wish to stick with Debian stable but have a
modern version of calibre. Alternatively, buster-backports has 3.48 at
least, which is still a year and a half old, but is more recently released
than this bug report...
Oh right, the up to date version of Debian is bullseye (did), not buster
(stable).
Buster is indeed distributing an ancient "stable" version of calibre due to
their freeze policy. You'll need to install calibre from the website
instead of from Debian if you wish to stick with Debian stable but have a
modern version of calibre. Alternatively, buster-backports has 3.48 at
least, which is still a year and a half old, but is more recently released
than this bug report...