Forgot to eject! 1,0 TB Hard Drive is appearing in Disks, but it is not appearing in Files

I had a situation were I had to move the computer from where it was. I turned off the computer and just disconnected every USB including the Hard Disk. Informations:

1. My Drive is plugged
2. I am trying to use my HD back again, off course, without loosing the files I already had.
3. I have tried to do sudo fsck /dev/sdb and it didn't work, I am now going to try chkdsk In windows.
4. I discovered that this drive is a NTFS (chkdsk is still loading).
5. CHKDSK is done, Windows showed this message in the cmd "It showed the text: "Windows verified the system of archives and did not find any problems" (translated from portuguese)."
6. chkdsk in terminal of ubuntu shows error message inside terminal "chkdsk: command not found ".

Now the Hard Disk is on and it is appearing in the Disks application. When I open the Disks application I only have these options available: "Format Partition..." "create Partition Image..." "Restore Partition Image..." "Benchmark Partition..."

Contents are appearing as unknown! sudo fdisk -l

lima@Lima:~$ sudo fdisk -l
[sudo] password for lima: 


Disk /dev/sda: 111,82 GiB, 120040980480 bytes, 234455040 sectors
Disk model: WDC WDS120G2G0A-
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: CC468874-3D11-4188-B15B-A6C133003A42

Device       Start       End   Sectors   Size Type
/dev/sda1     2048   1050623   1048576   512M EFI System
/dev/sda2  1050624 234452991 233402368 111,3G Linux filesystem

PS: I am going to edit the question instead of responding in the comments, thank you.

I just installed GParted in my Linux Ubuntu computer and a error message appeared. here is a picture of the error message I pressed "Cancel" and this is what appeared.