Where to put GCN bios for dolphin:
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/home/[your login name]/.local/share/dolphin-emu/GC/[USA|JAP|EUR]/IPL.bin

Source: https://forums.dolphin-emu.org/Thread-dolphin-in-linux-where-do-i-place-the-gamecube-bios-ipl
Date: October 8th 2022