Afraid I don't know anything about your vacku problems but you say
"ps aux" shows a lot of apps running, and I didn't which task to kill
As on old SysV unix hand, I prefer he Sysv ps -ef
This gives you similar information butt crucially gives th pid and ppid (parent pid). In many cases you can kill the parent task and it takes the childen down with it.
On a relted topic, you can be lazy (if you ae careful) and use 'killall' commandname. For insance, when I ssh into my servers it times out and freezes my terminal if I leave it for more than a few minutes. Instead of looking for the pid I just killall ssh. (Make sure you don't have another insstance that you *don't* want to kill!)
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