root@ubuntu ~ > apt remove proftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'proftpd-basic' instead of 'proftpd'
0 upgraded, 0 newly installed, 0 to remove and 16 not upgraded.
root@ubuntu ~ >
root@ubuntu ~ > apt purge proftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'proftpd-basic' instead of 'proftpd'
0 upgraded, 0 newly installed, 0 to remove and 16 not upgraded.
root@ubuntu ~ >
root@ubuntu ~ > apt install proftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'proftpd-basic' instead of 'proftpd'
proftpd-basic is already the newest version (1.3.5e-1build1).
0 upgraded, 0 newly installed, 0 to remove and 16 not upgraded.
root@ubuntu ~ >