Ubuntu Server 20.04 Reset Group Ownership?

Question

I have inadvertently changed the group ownership of the root directory on my Ubuntu Server 20.04 ☹️ Is there anyway to roll back the changes or reset the group ownership to out of the box (fresh install)?

I used the recursive option with the chgrp command which has obviously changed all files/folders below root. The command I used was sudo chgrp -R sambashare /

Any help or advice would be greatly appreciated

Answer 1

I hope this works :)

I made files with

getfacl -R {dir} >{dir}.facl

for system related directories. Downloads:

• var: https://drive.google.com/file/d/155VXpDsfjtrJJ2AYyq_Y_Sj0rjulQXAt/view?usp=sharing
• usr: https://drive.google.com/file/d/1jJ9MbWrZtUNiwCWBPChALdrpuGnR15uX/view?usp=sharing
• etc: https://drive.google.com/file/d/1SG4bwp-Hu5RuE_qB_GGDt5w3eVPXBWKz/view?usp=sharing
• bin: https://drive.google.com/file/d/1QpM1kDTfcvW68JX2Dh7GCjDFwHRXIsFo/view?usp=sharing

Use

setfacl --restore={dir}.facl

to reset them. Warning: Change the bin and var file and replace rinzwind (my username) with your username in the bin and var file before doing this.

If sudo permissions are changed use a live session or grub rescue to do this. A live session will be the easier method if you have one.