Comment 16 for bug 2003756

This bug also affects installing proftpd under 22.04.

apt install proftpd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Note, selecting 'proftpd-core' instead of 'proftpd'
proftpd-core is already the newest version (1.3.7c+dfsg-1build1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
[master d41b86764d] saving uncommitted changes in /etc prior to apt run
 Author: cseadmin <email address hidden>
 1 file changed, 1 insertion(+), 1 deletion(-)
Setting up proftpd-core (1.3.7c+dfsg-1build1) ...
usermod: no changes
Synchronizing state of proftpd.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable proftpd
Could not execute systemctl: at /usr/bin/deb-systemd-invoke line 142.
dpkg: error processing package proftpd-core (--configure):
 installed proftpd-core package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 proftpd-core
needrestart is being skipped since dpkg has failed
E: Sub-process /usr/bin/dpkg returned an error code (1)