Just a heads up for Helpers -
Chris had a Thread here
https://www.linux.org/threads/wifi-help.21380/page-3
where ultimately we were able to get him going by upgrading to Linux Kernel 4.18.0 -13, and doing some other voodoo.
He has a Realtek RTL8723 driver in place. Details also over there.
Chris
Now I know you have Timeshift on the Mint, but have you got it on the Ubuntu yet?
If not, then follow Brian's link above to Ukuu page. and do two (2) things:
1. Take the commands listed there to install Tony George's PPA to your Ubuntu
BUT
2. Where the 3rd line of code says
Code:
sudo apt-get install ukuu
and add a space and timeshift at the end, so
Code:
sudo apt-get install ukuu timeshift
This will install both Ukuu and Timeshift.
If you already have Timeshift installed, then just
Code:
sudo apt-get update
sudo apt-get -y install ukuu
Once Ukuu is installed, launch it.
In Ukuu, you should find that there are kernel listings up to and including 4.20.10 .
Personally, I would go straight for
4.18.0 -13
and install it, since we know it works.
Cheers
Wizard