Dovecot fails to reload after upgrade / code=exited, status=226/NAMESPACE

If your Dovecot fails to reload/restart after upgrade, chances are that your kernel is too old. But you can try and fix this problem with simple step bellow.

This was in syslog log:

systemd[20406]: dovecot.service: Failed at step NAMESPACE spawning /usr/bin/doveadm: No such file or directory
dovecot.service: Control process exited, code=exited status=226
systemd[1]: Reload failed for Dovecot IMAP/POP3 email server.

This was Dovecot service status:

● dovecot.service - Dovecot IMAP/POP3 email server
Loaded: loaded (/lib/systemd/system/dovecot.service; enabled; vendor preset: enabled)
Active: active (running) (Result: exit-code) since Tue 2021-09-07 19:31:12 CEST; 1 months 28 days ago
Docs: man:dovecot(1)
Process: 20406 ExecReload=/usr/bin/doveadm reload (code=exited, status=226/NAMESPACE)

To solve, you can try and edit dovecot service script and add coment to PrivateTmp variable.

root@mailmachine:~# vi /lib/systemd/system/dovecot.service

...
[Service]
Type=forking
ExecStart=/usr/sbin/dovecot
PIDFile=/var/run/dovecot/master.pid
ExecReload=/usr/bin/doveadm reload
ExecStop=/usr/bin/doveadm stop
#PrivateTmp=true
NonBlocking=yes
# Enable this if your systemd is new enough to support it:
#ProtectSystem=full
...

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