I can confirm that pure-ftpd and pure-ftpd-common from focal-proposed has fixed the bug for me.
Test done: followed the quick test plan and installed the old pure-ftpd and pure-ftpd-common from ppa upgrade pure-ftpd and pure-ftpd-common from focal and confirm the issue is seen (upgrade fails) Add focal-proposed to apt sources upgrade pure-ftpd and pure-ftpd-common and confirm upgrade works. Package tested: $ apt-cache policy pure-ftpd-common pure-ftpd-common: Installed: 1.0.49-4ubuntu0.1 Candidate: 1.0.49-4ubuntu0.1 Version table: *** 1.0.49-4ubuntu0.1 500 500 http://gb.archive.ubuntu.com/ubuntu focal-proposed/universe amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu focal-proposed/universe i386 Packages 100 /var/lib/dpkg/status 1.0.49-4 500 500 http://gb.archive.ubuntu.com/ubuntu focal/universe amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu focal/universe i386 Packages 1.0.46-1ubuntu18.04.1~ppa1 500 500 http://ppa.launchpad.net/sudipmuk/pure-ftpd/ubuntu focal/main amd64 Packages 500 http://ppa.launchpad.net/sudipmuk/pure-ftpd/ubuntu focal/main i386 Packages Also followed the normal test plan and install pure-ftpd on a bionic system Do do-release-upgrade to upgrade to Focal, confirm issue is seen Add focal-proposed to apt sources upgrade pure-ftpd and pure-ftpd-common and confirm upgrade works. Test result: the issue with pure-ftpd and pure-ftpd-common has been fixed. Package tested: $ apt-cache policy pure-ftpd-common pure-ftpd-common: Installed: 1.0.49-4ubuntu0.1 Candidate: 1.0.49-4ubuntu0.1 Version table: *** 1.0.49-4ubuntu0.1 500 500 http://gb.archive.ubuntu.com/ubuntu focal-proposed/universe amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu focal-proposed/universe i386 Packages 100 /var/lib/dpkg/status 1.0.49-4 500 500 http://gb.archive.ubuntu.com/ubuntu focal/universe amd64 Packages 500 http://gb.archive.ubuntu.com/ubuntu focal/universe i386 Packages ** Tags removed: verification-needed verification-needed-focal ** Tags added: verification-done verification-done-focal -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876597 Title: [SRU] package pure-ftpd-common 1.0.49-4 failed to install/upgrade: unable to open '/usr/share/doc/pure-ftpd-common/README.Authentication- Modules.gz.dpkg-new': No such file or directory To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pure-ftpd/+bug/1876597/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs