Apparently the new proftpd does not recognize an old entry, or an line was added to the config by the upgrade. Commenting the line make the problem go away (but how do I continue the upgrade?)
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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
DistroRelease: Ubuntu 21.04
Package: ubuntu-release-upgrader (not installed)
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.11.0-18.19-generic 5.11.17
Tags: hirsute dist-upgrade
Uname: Linux 5.11.0-18-generic x86_64
UpgradeStatus: Upgraded to hirsute on 2021-06-15 (0 days ago)
UserGroups: N/A
VarLogDistupgradeXorgFixuplog:
INFO:root:/usr/bin/do-release-upgrade running
INFO:root:No xorg.conf, exiting
_MarkForUpload: True
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