Public bug reported:
when you install a minimal impish, nft binary is not installed
(iptables-nft is installed)
later on if you want to install miniupnpd, apt chooses miniupnpd-
iptables which delivers /etc/miniupnpd/iptables_init.sh
the existence of this script and some other conditions are then checked
by /usr/libexec/miniupnpd-startstop-helper.sh in ExecStartPre section of
the systemd service, which fails when kernel filtering backend is nft
but the userspace utilities are iptables-nft
later on when user learns from miniupnpd systemd service log that
miniupnpd-nftables must be installed as well as the nftables package,
miniupnpd-nftables cannot be installed because the apt utility attempts
to autoconfigure miniupnpd too early, a step of reconfiguration is to
start the service, which fails because installing miniupnpd-nftables
only removes miniupnpd-iptables package but does not purge it, so
/etc/miniupnpd/iptables_init.sh file remains on disk and misleads
/usr/libexec/miniupnpd-startstop-helper.sh
the exit from this insane anti-user loop is to dpkg -P miniupnpd-
iptables and reattempt installation of miniupnpd-nftables. or complete
purge of miniupnpd and manually explicitly ask for miniupnpd-nftables
and nftables packages when installing miniupnpd.
** Affects: miniupnpd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1956001
Title:
cannot install miniupnpd in a minimal ubuntu installation
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