I would like to update an Ubuntu installation from 32 to 64 bit. I'd also like to save most of the configurations, especially the installed packages because I have added and deleted quite a big number of them.
So the basic idea is to backup the /etc, /var, and /home directories (actually these are two separate partitions, so I suppose that I could simply not format them), make a fresh installation, and reinstall the old packages. Then copy the relevant /etc/directories from the older installations.
What I am trying to find is how to automate the package reinstall, and if it's possible, to automate the /etc restore.
Are the instruction found in this answer still valid? https://ubuntuforums.org/showthread.php?t=261366
I found out how to do this recently and thought it might be helpful to >some people. To output this information to a file in your home directory >you would use,
Code: dpkg --get-selections > installed-software And if you wanted to use the list to reinstall this software on a fresh ubuntu setup,
Code: dpkg --set-selections < installed-software followed by