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I'm using an old version of OpenSUSE and when I try to update some package via the command line, e.g.
Zypper update firefox
it shows the message listed below.
System management is locked by the application with pid 2181(/usr/sbin/packagekitd).
Close this application before trying again.
You already have a Zypper instance running, that's what the error message is telling you. Just kill the other process and try again:
sudo kill 2181
If that doesn't work try
sudo kill -9 2181
suorsudo)