11 1 2. As always, the short answer to all similar questions is NO. Unless you're a coder -and- have access to all the necessary drivers you can't simply install Ubuntu in an unnamed ARM hardware. And Raspberry OS is based on Debian, not Ubuntu. โ ChanganAuto.
If all else fails, look at Arch linux (or gentoo if you are a bit crazy). Installing either of those will be hard, but it might be a lot better documented than something like a Ubuntu based system. Also you may want to just try a dual boot. It is probably going to be a heck of a lot easier than Linux on a tablet.
With the device powered off, hold Volume Up + Power. Then, press Continue on the installer. The key combination may vary depending on your device, however, UBPorts will show you a picture of exactly what you need to do. The installer will download the necessary files, then flash recovery and boot images.. 25 1 495 268 459 321 414 383