Raspberry Pi OS busterをbullseyeへアップグレードしようとしたところ、
https://www.tomshardware.com/how-to/upgrade-raspberry-pi-os-to-bullseye-from-buster
の手順中
# apt dist-upgrade (中略) The following packages have unmet dependencies: libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6+rpi1 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
で停止
https://www.reddit.com/r/debian/comments/h878ci/fullupgrade_to_debian_testing_fails_due_to/
などにある
# apt install gcc-8-base
で解決した模様。
