“they” changed things… so now it’s bad to open graphical application as root (suddenly) - it’s kind of beyond the scope of this and Ubuntu has loads of user-friendly-ness to protect you from yourself so I didn’t telly you how I’d do it.
Yes, as I read this I recalled I had a decommissioned tablo and drive (yet to be listed on ebay). Seems you’ve passed this point in other posts.
Still thinking, everything should be intact on your old tablo.
One day when you get all this back together… something to consider trusting 3TB archives of video to a semi-proprietary system? I’d suggest considering backing things up - Backup-tablo.sh - Backup all recorded shows from a Tablo.