Does Ubuntu have some custom migration tools, or are we talking about generic dotfiles?
Discussion
yeah, i'm in the middle of needing to do such a migration but i'm just using the same version and should be able to migrate most of the files just need to install a couple things
most of my infra is built from go source code so worst case i have to install #golang and "go install" et voila
one day, there will be an OS that is built on go, for everything, and you will literally be able to install it from a 300mb install image in under an hour all built from source code except kernel and initial environment