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Can’t do a manual fsck on root system [SOLVED]

Lenovo B50-10 running Ubuntu 18.04

A mate sent me his Lenovo laptop to fix as it wouldn't boot and indicated a manual fsck was necessary. 
It boots straight into the GRUB screen (without pressing the Shift key).  I selected "Advanced options for Ubuntu" and then selected "Recovery Mode" expecting to see another screen with a recovery mode menu so I could choose manual fsck, but it did an auto-fsck on /dev/sda2 and outputted two pages of stuff, exiting with Code 4 (which is just "File syste...
Lenovo B50-10 running Ubuntu 18.04

A mate sent me his Lenovo laptop to fix as it wouldn't boot and indicated a manual fsck was necessary. 
It boots straight into the GRUB screen (without pressing the Shift key).  I selected "Advanced options for Ubuntu" and then selected "Recovery Mode" expecting to see another screen with a recovery mode menu so I could choose manual fsck, but it did an auto-fsck on /dev/sda2 and outputted two pages of stuff, exiting with Code 4 (which is just "File syste...