If we have a distro (A) based on a distro (B), and the distro (B) get un upgrade (it becames B.01) can we have un upgrade to the (A) distro to make it based on (B.01)
I think it is possible. Here is a community tutorial on Linux Mint about doing so .
The caveat is that you may have problems depending on the level of customization you had, as well as package conflicts and other such problems. The comments on those articles suggest that the procedure mostly works, with some known definite issues.
The procedure, in this case, is simply to update entries in
/etc/apt/sources.list to use the newer release (perhaps from a newer version of the derived distro), and run:
sudo apt-get update sudo apt-get dist-upgrade
Oddly enough, the tutorial lists
sudo apt-get upgrade as a step again after the
dist-upgrade (to what end I do not know).
This really depends on how much customization the derivative does. For example, Ubuntu is often said to be based on Debian, but there is only a loose correlation or connection between Ubuntu and Debian releases.