I try to perform the following command in Ubuntu 14.04:
systemctl enable --now docker-cleanup-dangling-images.timer
I also tried it with sudo, I tried to replace systemctl with service and systemd but nothing works
sudo: systemd: command not found
systemd: command not found
sudo: service: command not foud
How can I execute this command in Ubuntu 14.04 or is there another way to execute the same command?
I just encountered this problem myself and found that Ubuntu 14.04 uses Upstart instead of Systemd, so systemctl commands will not work. This changed in 15.04, so one way around this would be to update your ubuntu install.
If this is not an option for you (it's not for me right now), you need to find the Upstart command that does what you need to do.
For enable, the generic looks to be the following:
update-rc.d <service> enable
Link to Ubuntu documentation: https://wiki.ubuntu.com/SystemdForUpstartUsers