Error when launching nRF Connect for desktop on Linux.

I have recently installed nRF Connect for desktop V3.0.0 on my ubuntu machine and I installed the Bluetooth Low Energy App but it doesn't launch and I keep getting this error : 

   " Error while probing devices: Error occured when get serial numbers. Errorcode: CouldNotOpenDLL (0x7) Lowlevel error: JLINKARM_DLL_NOT_FOUND (ffffff9c) " and I can't seem to find this missing file. Also when I tried to download JLink from SEGGER website I went through all the steps to get to the download link of the .deb file but when the download finishes I get a .html file and not the .deb. I don't really get what's going on.

Please can anyone help me.

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