Problem with many services after installing and deleting mongodb.

I'd try to investigate why these services are failing:

journalctl -b --no-pager -u sshd

journalctl -b --no-pager -u fail2ban

etc.

There may be more detailed info in service specific log files e.g.

less /var/log/fail2ban.log

tap G to scroll to the end.

Looks like MySQL did start, and your failures (in the screenshot) are of fail2ban and sshd.

PS - when un-installing stuff, better check what packages are going to be removed, apt-get does tell you :)

Hi
i did it with postgres:
https://www.dropbox.com/s/teouuub531zbpk3/Captura%20de%20pantalla%202019-04-25%2013.34.23.png?dl=0

ssh:
https://www.dropbox.com/s/5njv2wb6wczrv46/Captura%20de%20pantalla%202019-04-25%2013.34.48.png?dl=0

fail2ban:
https://www.dropbox.com/s/n7fwog0d5lhwi54/Captura%20de%20pantalla%202019-04-25%2013.35.10.png?dl=0

less /var/log/fail2ban.log
https://www.dropbox.com/s/1s6jzg15qgzy6sm/Captura%20de%20pantalla%202019-04-25%2013.35.37.png?dl=0

/usr/sbin/sshd -T
https://www.dropbox.com/s/js9hfb5qwuc7ea6/Captura%20de%20pantalla%202019-04-25%2013.36.58.png?dl=0

thank you for your reply!

sshd is complaining about "missing privilege separation directory /var/run/sshd".

https://serverfault.com/questions/941855

Maybe you uninstalled package systemd-tmpfiles somehow?

Please try to install that back, see apt says it's already installed - or actually downloads and installs it.

EDIT - systemd-tmpfiles is part of base systemd package, which must be installed. Maybe try to reinstall it using apt-get install --reinstall systemd?

PS - I assume you're using Debian or Ubuntu?

PPS - it'd be more useful to share logs as text if you can so their content isn't clipped (if the issue continues are there are more logs to show).

If systemd-tmpfiles is arleady installed, you could try

systemd-tmpfiles --create

to see if there are any errors.