I encrypted a 1TB external hard drive with LUKS when formatting using Disks and used it for backups with Grsync. I had to wipe my hard drive, and now I want to restore all my files from the external disk, but I don't know how. It shows in Disks and says it's mounted but that doesn't make sense as I didn't input a password (and the pw can't have been be stored by the OS as it's a clean install), and it doesn't show in Files so I can't open it. I installed Grsync but there doesn't seem to be any way to select that disk to restore from. Other hard disks work fine. I have tried accessing it in an Ubuntu guest in Virtualbox on Windows host, but it just says there's some error connecting it.
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 160.5M 1 loop /snap/firefox/1377
loop1 7:1 0 61.9M 1 loop /snap/core20/1405
loop2 7:2 0 61.9M 1 loop /snap/core20/1434
loop3 7:3 0 155.6M 1 loop /snap/firefox/1232
loop4 7:4 0 4K 1 loop /snap/bare/5
loop5 7:5 0 248.8M 1 loop /snap/gnome-3-38-2004/99
loop6 7:6 0 81.3M 1 loop /snap/gtk-common-themes/1534
loop7 7:7 0 45.9M 1 loop /snap/snap-store/575
loop8 7:8 0 45.9M 1 loop /snap/snap-store/582
loop9 7:9 0 43.6M 1 loop /snap/snapd/15177
loop10 7:10 0 44.7M 1 loop /snap/snapd/15534
loop11 7:11 0 284K 1 loop /snap/snapd-desktop-integration/10
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 16M 0 part
├─sda2 8:2 0 513M 0 part
└─sda3 8:3 0 931G 0 part /
nvme0n1 259:0 0 953.9G 0 disk
├─nvme0n1p1 259:1 0 100M 0 part /boot/efi
├─nvme0n1p2 259:2 0 16M 0 part
├─nvme0n1p3 259:3 0 953.3G 0 part
└─nvme0n1p4 259:4 0 499M 0 part
