I want to install Ubuntu on my computer, but do not know whether you want to update the BIOS before installing.
Tell me, whether it is necessary to update the BIOS before installing Ubuntu?
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Generally you don't but it really depends, you can install Ubuntu first to see if it's running smoothly on it. Sometime BIOS upgrade can fix some issues in Linux.
For example, on Dell XPS 13 9343, user may experience some key repeat bug, and this one can be fix by upgrading the BIOS (AFAIK, this issue do exist across several Dell laptops).
So please check the vendor's website for the BIOS release note to determine if you need it.