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Hi, in my case i had an unmet dependency in ubuntu 20.04 lts, which was libc6, and there was no libc6-dev because of the version conflict just reinstall libc6 with the same requirement of libc6-dev and then install libc6-dev. you'll be able to install noetic successfully. in my case libc6-dev needs to be with 2.31-0ubuntu9.2 but the libc6 was 2.31-0ubuntu9.3, so i reinstalled libc6 with 2.31-0ubuntu9.2 and things went fine after that. (don't remove anything, just reinstall)

sudo apt install --reinstall libc6 = 2.31-0ubuntu9.2