Hi, before trying to remove the lock file you should make sure that you have no other package managers opened eg synaptic, apt-get, update-manager, dpkg. If none of those are open then open a terminal and type
this will give a list of running processes check down the list that no package manager is running (synaptic, apt-get, update-manager, dpkg) if there is then you will need to kill the process which you can do with
(replace name with name of process)
if there are no package manager processess running then remove the lock with
Code:
sudo rm /var/lib/dpkg/lock
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