[ubuntu] Problems with mounting hard drive

Hi,

I have inherited a WD Red (NAS) drive , 4 TB, from a computer that was running Ubuntu. The old computer had to shut down instantaneously without any chance to back up data.
I have installed Ubuntu on a new computer. Now, I want to retrieve data from the 4 TB drive.
When I connect it, the system doesn't know what to do with it.
I know that this probably was in use as a boot drive for Ubuntu, but now I have set up Ubuntu to boot from another drive when I configured my new system. However, if I have this drive hooked up, Ubuntu doesn't boot at all. It then stays on the "booting from hard drive" screen forever.

I list the outputs of some commands that I used to investigate the drive status.

df -h (doesn't list the drive)
lsblk lists the drive as /dev/sdc and shows that it has partitions (sdc2 and sdc3). Doesn't show a mount point.
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sudo parted /dev/sdc unit s print
Model: ATA WDC WD40EFRX-68W (scsi)
Disk /dev/sdc: 7814037168s
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:

Number Start End Size File system Name Flags
2 1050624s 1550335s 499712s
3 1550336s 7814037133s 7812486798s lvm
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dmesg | tail
[ 190.857967] scsi 0:0:1:0: SATA: enclosure_logical_id(0x500605b00652f970), slot(0)
[ 190.858160] scsi 0:0:1:0: atapi(n), ncq(y), asyn_notify(n), smart(y), fua(y), sw_preserve(y)
[ 190.893931] sd 0:0:1:0: Attached scsi generic sg4 type 0
[ 190.898593] sd 0:0:1:0: [sdc] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
[ 190.898596] sd 0:0:1:0: [sdc] 4096-byte physical blocks
[ 190.902436] sd 0:0:1:0: [sdc] Write Protect is off
[ 190.902439] sd 0:0:1:0: [sdc] Mode Sense: 7f 00 10 08
[ 190.903383] sd 0:0:1:0: [sdc] Write cache: enabled, read cache: enabled, supports DPO and FUA
[ 190.953075] sdc: sdc2 sdc3
[ 190.963859] sd 0:0:1:0: [sdc] Attached SCSI disk
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sudo fdisk /dev/sdc
p
disk /dev/sdc: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: B9EE12BE-3831-438D-B4D4-B9C4A8FFCCB6

Device Start End Sectors Size Type
/dev/sdc2 1050624 1550335 499712 244M Linux filesystem
/dev/sdc3 1550336 7814037133 7812486798 3.7T Linux LVM

i 2
Device: /dev/sdc2
Start: 1050624
End: 1550335
Sectors: 499712
Size: 244M
Type: Linux filesystem
Type-UUID: 0FC63DAF-8483-4772-8E79-3D69D8477DE4
UUID: 9CCE7339-B3DB-4AB0-9B4B-690D6189600F

i 3
Device: /dev/sdc3
Start: 1550336
End: 7814037133
Sectors: 7812486798
Size: 3.7T
Type: Linux LVM
Type-UUID: E6D6D379-F507-44C2-A23C-238F2A3DF928
UUID: 9FF32069-D751-4144-96D7-D135DA55E846

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sudo mke2fs -n /dev/sdc
mke2fs 1.42.13 (17-May-2015)
Found a gpt partition table in /dev/sdc
Proceed anyway? (y,n) y
Creating filesystem with 976754646 4k blocks and 244195328 inodes
Filesystem UUID: 43624be8-77e3-430a-8e0b-5e76869d5caa
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848, 512000000, 550731776, 644972544

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sudo e2fsck -f /dev/sdc
e2fsck 1.42.13 (17-May-2015)
ext2fs_open2: Bad magic number in super-block
e2fsck: Superblock invalid, trying backup blocks...
e2fsck: Bad magic number in super-block while trying to open /dev/sdc

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem. If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
or
e2fsck -b 32768 <device>

same output when i use sdc2 or sdc3 instead of sdc.

I tried using 8193 and 32768 as superblocks and get the same out put as above. The only exception is with sdc2 where I get an extra message about invalid argument. see below.

sudo e2fsck -f -b 32768 -y /dev/sdc2
e2fsck 1.42.13 (17-May-2015)
e2fsck: Invalid argument while trying to open /dev/sdc2

The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem. If the device is valid and it really contains an ext2/ext3/ext4
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
or
e2fsck -b 32768 <device>

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sudo gdisk -l /dev/sdc

GPT fdisk (gdisk) version 1.0.1

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdc: 7814037168 sectors, 3.6 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): B9EE12BE-3831-438D-B4D4-B9C4A8FFCCB6
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 7814037134
Partitions will be aligned on 2048-sector boundaries
Total free space is 1050591 sectors (513.0 MiB)

Number Start (sector) End (sector) Size Code Name
2 1050624 1550335 244.0 MiB 8300
3 1550336 7814037133 3.6 TiB 8E00

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I have absolutely no idea what to do to mount it to retrieve the data.

Please help.

Thanks.