Hello kovidgoyal (you are so quick to answer
)
Code:
I used
sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.py | sudo python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"
to upgrade, and after the upgrade
calibre-server --manage-users
didn't show any user any more and I had to recreate them.