You do actually have packages left over installed from the ubuntu-
toolchain-r PPA or the jonathonf_ubuntu_gcc-7 PPA and those packages are
preventing your ability to upgrade to a new release of Ubuntu. You'll
need to resolve this issue, likely by installing the official Ubuntu
packages, yourself and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1874121
Title:
I've tried to upgrade Ubuntu 16.04 to 18.04 from terminal but I
couldn't do it. I have no problems with ppa, that doesn't apply in
this case.
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