Next, I installed Trisquel Mini to a USB flash drive and booted from it, then
tried the same command to get to the files on the hard drive and set to work
again. It did not work.
What is the error message?
I looked in the File Manager and noticed the partition I am trying to get to
on the hard drive is not recognized by the name I gave it when I created it.
It is no longer, sda3, but Trisquel sees it as, 500 GB Volume.
This is normal behavior. You can label a filesystem using for instance the
"Disks" utility in the "System settings" (select the disk, the partition and
click on the gears and then choose to "edit filesystem") or the commands it
calls and that are specific to a type of filesystem (e.g., 'e2label' changes
the label on an ext2/ext3/ext4 filesystem). But, again, that will not solve
your permission issue.
Perhaps it is mounted already
The 'mount' command (no argument) lists the mounted filesystems.
What is the content of your /etc/fstab?
The hard drive has three partitions, one is swap, the next is ext4 running
Tahr Pup 6.0.3 CE, and the last is ext4 with nothing installed on it. It is
where all my files are stored
You want the same user id (uid) for Puppy and Trisquel. Otherwise you would
have to change the permissions every time you switch from one system to the
other one. In Trisquel you can do that from the "Advanced parameters" of the
user. 'users-admin' is the related command. You first need to create a new
user with administrative privileges to edit the previous user with this new
one. The uid in puppy can be read from the third column of the line in
/etc/passwd that starts with your login (or typing 'echo $UID' from Puppy's
terminal).
What about overwriting Puppy with Trisquel? :-p