Verified according to test case from description:
halves@bionic-vm:~$ sudo grep use_pty /etc/sudoers
Defaults use_pty
halves@bionic-vm:~$ dpkg -l | grep sudo
ii sudo 1.8.21p2-3ubuntu1.3
amd64 Provide limited super user privileges to specific users
halves@bionic-vm:~$ for i in {1..10}; do sudo -- cat /var/log/syslog; done
Oct 1 14:37:40 bionic-vm kernel: [ 0.000000] Linux version
4.15.0-118-generic (buildd@lgw01-amd64-039) (gcc version 7.5.0 (Ubuntu
7.5.0-3ubuntu1~18.04)) #119-Ubuntu SMP Tue Sep 8 12:30:01 UTC 2020 (Ubuntu
4.15.0-118.119-generic 4.15.18)
O
....
Oct 23 15:53:15 bionic-vm systemd[1]: Started User Manager for UID 1000.
Oct 23 15:53:15 bionic-vm systemd[1810]: Reached target Default.
Oct 23 15:53:15 bionic-vm systemd[1810]: Startup finished in 30ms.
halves@bionic-vm:~$
** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic
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https://bugs.launchpad.net/bugs/1895757
Title:
Terminal hangs running sudo when "use_pty" is set in /etc/sudoers
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