This happened to me when upgrading from Groovy to Hirsute just now, with
the same symptoms as above - I had `search .` in resolv.conf, but
nothing creating that entry in /etc/netplan or in

I fixed the broken package by fixing the erroneous entry
/etc/postfix/ (removing the ".." at the end of the hostname) and
then running:

sudo dpkg-reconfigure --force postfix
sudo systemctl reload postfix

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  dpkg hook hostname error

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