Which 2.8.1? Legacy?

[VanillaMozilla]

I'm updating from 2.7.4, and I'm not sure which appimage to choose.  I'm not sure whether to choose 2.8,1 or 2.8.1 Legacy, because I'm not sure what qualifies as an older computer.

Ubuntu 18.04.6 LTS
Intel Core i5-7400 3 GHzx4
Intel HD Graphics 630 (KBL GT2)
7.7 GiB

[eumagga0x2a]

Legacy appImages have been discontinued, you should either try to build from the current source yourself or, better, update to a less outdated Linux distribution.

I'm not sure what qualifies as an older computer.

You need glibc version 2.28 or later to be able to run official supported "nightly" appImages. Applied to Ubuntu, this equals to Ubuntu 20.04.x or later. Hardware doesn't matter.