I was messing around with the Debian installer for another printer driver and ended up in exactly your situation. I eventually discovered that the installer had changed permissions on a bunch of other folders and that was causing the
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/usr/lib/cups/cgi-bin/admin.cgi: Permission denied
/usr
/usr/local
/usr/share
/usr/share/doc
Each one should have root:root ownership and 755 permissions.
For any one that's wrong, run
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chown root:root xxx
chmod 755 xxx