[Solved] can't upgrade from Buster to Bullseye

[vp_nbi]

I followed the online documentation for upgrading, but something in the upgrade process appears to be broken. I double checked the repository information which is correct.

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apt-get dist-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Error!
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

This doesn't make sense. Both libc6-dev and libgcc-8-dev are at the Buster level (as is libc6). What is it complaining about? We expect everything to be at the Buster level prior to the upgrade.

UPDATE: Problem solved. I'm not sure how, but I constructed a lengthy apt-get install command with arguments in the form of package/bullseye. I simply kept adding the dependency packages to the command until there were no more unresolved dependencies. Why this didn't happen automatically with apt-get dist-upgrade is a mystery to me, but I seem to have successfully upgraded to Bullseye as Synaptic shows Bullseye versions and there are no broken packages.

[lami07]

There is currently bug in debian gcc-8, which is already fixed in unstable, and soon should be in testing. For now  issue with

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The following packages have unmet dependencies:
libc6-dev : Breaks: libgcc-8-dev (< 8.4.0-2~) but 8.3.0-6 is to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
can be fixed by manually upgrading gcc-8-base package ( sudo apt install gcc-8-base ) prior to conducting full system upgrade.

[Akito]

Thank you very much, lami07. This solution works on my Raspberry Pi running DietPi, based on Raspbian Buster.

[lami07]

You are welcome akito.