Thanks aloniv!
I have the following difficulty with the recommended process; I'll keep
trying though:
muhammed@muhammed-ThinkPad-T400:~$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 149.1G 0 disk
├─sda1 8:1 0 14G 0 part /
├─sda2 8:2 0 1K 0 part
└─sda5 8:5 0 135.1G 0 part
└─sda5_crypt (dm-0) 252:0 0 135.1G 0 crypt
├─trisquel--vg-swap_1 (dm-1) 252:1 0 5.5G 0 lvm
└─trisquel--vg-home (dm-2) 252:2 0 129.5G 0 lvm /home
sdb 8:16 1 29.8G 0 disk
└─sdb1 8:17 1 29.8G 0 part
/media/adel/Lexar1
sr0 11:0 1 1024M 0 rom
muhammed@muhammed-ThinkPad-T400:~$ sudo unmount /dev/sdb
[sudo] password for adel:
sudo: unmount: command not found
