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1e376f7945
Since ff541b8 introduced APT::Install-Recommends "false", we need to
explicitly install resolvconf. Fixes DNS breakage caused by apt.upgrade
with auto_remove=True purging resolvconf as an orphan and removing
'nameserver 127.0.0.1' in /etc/resolv.conf that pointed to the local
unbound, in consequence DNS resolution breaks and filtermail-incoming
exits because it cannot find resolvers.