Probably a duplicate of: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1889250
In other words, follow suggestion of removing nodejs and then trying the upgrade again: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1889250/comments/2
Probably a duplicate of: https:/ /bugs.launchpad .net/ubuntu/ +source/ ubuntu- release- upgrader/ +bug/1889250
In other words, follow suggestion of removing nodejs and then trying the upgrade again: https:/ /bugs.launchpad .net/ubuntu/ +source/ ubuntu- release- upgrader/ +bug/1889250/ comments/ 2