Seagate external hard disk not detecting in my ubuntu 16.04

I have a 2 TB Seagate external hard disk. In my ubuntu 16.04 it stopped detecting. I tried mounting this drive in another ubuntu 16.04 & Windows 7. In both machines, it is working.

When I plug it into my desktop, the light on the disk turns on. But I don't see the drive in my system.

The output of sudo parted -l shows only the internal drives. I tried running ls /dev/ | grep sd but same results.

But in the output of usb-devices I can see the device.

T: Bus=02 Lev=01 Prnt=01 Port=06 Cnt=01 Dev#= 21 Spd=5000 MxCh= 0
D: Ver= 3.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 9 #Cfgs= 1
P: Vendor=0bc2 ProdID=ab26 Rev=01.08
S: Manufacturer=Seagate
S: Product=BUP Slim BK
S: SerialNumber=NA9KLFBN
C: #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=896mA
I: If#= 0 Alt= 1 #EPs= 4 Cls=08(stor.) Sub=06 Prot=62 Driver=uas

Please help me with this issue.

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