This appears to be caused by sudo-rs, which is currently the default
sudo implementation in Questing (thanks schopin for suggesting that). As
a workaround you can revert to "classic" sudo:
apt install sudo
update-alternatives --config sudo
** Also affects: rust-sudo-rs (Ubuntu)
Importance: Undecided
Status: New
** Changed in: rust-sudo-rs (Ubuntu)
Status: New => Confirmed
** Changed in: sudo (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2121898
Title:
sudo hangs when hostname resolution fails due to FQDN lookup being
enabled by default (--with-fqdn)
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