However it may be worth starting ubuntu in recovery mode, assuming you can, then mounting the ubuntu partitions as read/write instead of read only with
Code:
mount -o rw,remount /
though as it is the /home partition, not root that is at fault, you may not even need that command.
You can then try changing ownership of the /home partition back to your ubuntu username with
Code:
chown -R username:username /home/username
and also permissions to the ubuntu default with
Code:
chmod -R 755 /home.#/username
It is also worth looking for the UID of the fuduntu user to see if that is different from the ubuntu UID of 1000 for the first user, though I am not sure if or how you can change that back; perhaps the
chown and
chmod commands will do it for you.
This is, indeed a salutary lesson not to try and share the same user in a /home partition; use the same partition by all means, but make sure you have a different username and therefore home folder within /home for each OS
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