Rpsc3 doesn't start at all [LINUX]

Greetings,
i've downloaded RPSC3, mad eit executable and tried to start it both by click and by terminal, however nothing happens and in terminale i get a "command not found" error.

My system is linux mint 18.3 MATE 64bit
Memory 7,7GB
Processor: Intel® Core™ i7-2670QM CPU @ 2.20GHz × 8

Graphic Card Nvidia GT550M

Can someone help me?
Thanks.

You're not executing it properly. This is not an RPCS3 issue.
It's ./filename with the AppImage having +x permissions

I did as you said and now i get this:

"Debugger: 0
Log file open failed: /home/reshaim/.cache/rpcs3/RPCS3.log.gz (error 13)
qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found.
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

Available platform plugins are: xcb.
"
Already tried "sudo apt-get install libxcb" and doesn't find the libscb package, while "sudo apt-get install libxcb1" says i already have the most recent version.

---

[SOLVED]

solved with this:

sudo apt-get install libxcb-xinerama0

Wrote here for future reference in case anyone else get the same issue.