Hi Rosika,
You mentioned in this post that you keep having kernel panic problems.
I believe you should try connecting your Linux disk to your motherboard and not use it as a USB peripheral on a daily basis.
If you want, I’m willing to help you do it, if only for a test run.
We can talk by PM, email, WhatsApp, etc., but you know how limited my English is (maybe we can understand each other with a “Portuguese-English” language and a dictionary for some help 
).
I’m convinced that it’s essential to eliminate the use of your system disk via USB
Jorge