Configuration - Dual boot
SSD 240G - Ubuntu 16.04
SSD 1TB -Ubuntu 16.04
WD 1TB - for storage
WD 2TB - for storage

After changing SSD 1TB to a new SSD 2TB - Ubuntu 16.04, dual boot failed. It always boots SSD 2TB even selecting to boot SSD 240G.

To boot SSD 240G I have to unplug the cables of SSD 2TB.

Please advise how to check and to sort out this problem.

Thanks in advance