For the people who wonder how a T420 can have a E-350 APU:
It doesn't 
I decided to test/install 24.04 also on my ASUS F3T (nVidia) and on my crappy Toshiba (which is the one with the E-350 APU)
(b.t.w. all three refused to start Xorg via lightdm just after an update, see previous message.)