I see two main things there :
1st :
- W: GPG error: https://dl.yarnpkg.com/debian stable InRelease: The following signatures were invalid: KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1580619281 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983 KEYEXPIRED 1507181400 KEYEXPIRED 1546376218 KEYEXPIRED 1546372003 KEYEXPIRED 1580619281 KEYEXPIRED 1580607983
As you are under Ubuntu, I don't know why this thing would look for a Debian repository.
But anyway, that's not the concern of this message which say that the key stored on your server and used to validate the repository has expired.
This is part of the issue, which seems to rely clearly there :
- [ERROR] autoinstaller::Adapter::DebianAdapter::_updatePackagesIndex: Couldn't update package index from remote repository:
I short, you have some repositories that are unable to "update", as such, the installer fail.
I suppose that even the old-man "apt-get update" will just fail the same way.
Check your sources used for Aptitude, as some may just be broken (and I don't know what this "yarnpkg" come from)