cannot select arduino due on ubuntu 18.04

Hello there,

this is what I did:

  • installed Ubuntu 18.04
  • installed arduino ide 1.8.5 64bit for linux via terminal
  • installed sam board package

Now, the arduino due entry can be seen in the board selection menu but i cannot click on arduino due (native, programming port). a -click on that entry shows no effect.

I have tried the same with 1.8.4. It's the same issue there.

Can you help me please?

Thanks alot,