Is it a good idea to install 21.04 of a Thinkpad T420?

[Phil]

My previous thread dealt with a heat problem cause by an extremely slow 
Internet connection. I also mentioned that I've used KDE for many years 
and that I've used XFCE with a very old laptop. Some applications, Lucky 
backup for example, that are run under KDE also make the laptop run hot.

Liam mentioned that he uses XFCE on his T420 and this has got me 
thinking and now I'm wondering about the wisdom of replacing my 20.10 
Kubuntu installation with Xubuntu 21.04. However, I'm concerned about 
Canonical's warning about not upgrading to 21.04. I really don't want to 
boot into a black screen.

I'm in the process of downloading Xubuntu 21.04 while I have a 
reasonably fast Internet connection. So, I'm wondering if other Thinkpad 
T420 owners have installed version 21.04 without any problems?

-- 
Regards,
Phil