1- WARNING! THIS WILL ERASE YOUR DISK >>> (sdb, 2TB)
fdisk /dev/sdb
first, you need to delete. press d. then, press n, select primary (press p), select space number (select 1), enter, +1.9T enter. press w
2-
mkfs --type ext4 /dev/sdb1
if you get any error at this stage, you need to control file system
file -s /dev/sdb1
if there is a filesystem for sdb1, you have to delete it. after deleting it, run the mkfs command
wipefs -a /dev/sdb1
3-
mkdir /media/2TB1
4-a (temp way, you will have to do this after your new logins)
mount /dev/sdb1 /media/2TB1
54-b (perm way. do just once)
sudo nano /etc/fstab
add this line to the file, then press ctrl+O enter and ctrl+x
/dev/sdb1 /media/2TB1 ext4 defaults 0 0
type
mount -a
now, you can use your 2TB disk in ubuntu. if your aim is not formatting your disk, please let me know. we may road another way for you.