Stalled system shutdown

[José Luis González <bugs.jlg@gmail.com>]

Hi,

When shutting down, after upgrading to Debian 11, system shutdown hangs
(freezes) for some time (about 1-2 minutes) anytime, making it
bothersome to shut the system down.

The freeze happens afther the "Stopped target remote filesystems"
status line. After a while "A stop job is running for ntopng" is
printed with an "in progress" status in red and a timeout of 1 minute
30 seconds, which is exhausted. So everyt time I shut down I get a 1
minute and 30 seconds delay.

Anyone can help, please?