It happens often that when I boot my Ubuntu 18 machines and I want to manually update my software I get stuck into errors involving something already using apt (endless waiting unattended-upgrades and / or other services).
Most of time with machines or virtual machines that are not booted frequently, where a boot and the next are followed by many days or 4-5 months, meanwhile maybe some certificates, mirrors or somethings else has changed and unattended-upgrades just get stuck on endlessy timeouts trying to contact servers that are not there anymore..
This is the error:
user@ubuntu:~$ sudo apt-get upgrade E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarly unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
I would like to know if there's a command line to gently terminate all instances using apt, leave the apt environment and configuration in a coherent state and be ready to use the gui version of ubuntu Software Updates or apt-get.