Mount new ~ to old one in another partition

[m654321]

[member=6970]Roy[/member]  am I correct in thinking you are dual booting, LL 3.8 and LL 4.0 where you have LL 3.8 home on another partition. If so trying to use the same config files for both systems will break things.

An easier option would be to leave things as is, LL 3.8 with home on the other partition and LL 4.0 with home in its own partition. Then create soft links from LL 4.0 home to the data folders (Documents, Downloads, Music, Videos etc). That way your config files stay safe but you can share data between systems.

"Man ln" is a good source for soft links

DeepThought has a point - this is your best option: soft-linking, also known as symlinking (symbolic-linking).
With this you can access your data files on a dedicated data partition from both your versions of LL, or from any other OS you may install on your PC.If you have a second drive bay, you could have the second drive as a data-only drive, which can also be removed (if need be) and accessedby other PCs.

Let me know if you want to know how to do this and I'll write a short tutorial for you - it's a quick method - won't take you long to carry out if you're happy using the terminal.
There is already a 'symlinking tutorial' on this forum by goldfinger, but I had some issues with it as it caused some instability with
in a Linux multiboot system.

Either way, just let me know ...