Battery won't charge and trackpad buttons don't work on Ubuntu

I just received a new Dell Precision 7750 which came with Windows 10 installed. As I use the Nvidia data science stack for my work, I've installed Ubuntu, as this machine is supposedly certified.

Unfortunately, I've encountered a number of issues.

1. My battery won't charge past 28%. I've tried a range of BIOS settings, and it has yet to go past 28% on either Ubuntu 18.04 LTS or Ubuntu 20.04 LTS.

2. The buttons below the trackpad don't work properly.

From what I have read, the version of Ubuntu that ships with the 7750 is tweaked to work, but the tweaks present are not within Ubuntu itself, so if you install Vanilla Ubuntu you'll face configuration issues.

When I try to download the Ubuntu image for my machine, the Dell site won't allow me because it shipped with Windows. I contacted Dell support and they said they couldn't provide the OS image and wanted to charge me for support.

Has anyone had success in getting this installed and working properly, please? I'd really appreciate any tips.

Thanks!