@LarryB1607 Are you running on the your installed LL?
If so - its possible, if sdc5 & 6 are sub to sdc1 (?? - as its extended, havent messed with extended partitions for some time)
That it cannot check because those are mounted...
also... in your output fsck... it says "fsck.ext2"
You could try ... see if any better... although I assume the same...
sudo fsck.ext4 -y /dev/sdc1
or
sudo e2fsck -y /dev/sdc1
BUT what are the hopes in checking sdc1? its not the root/data partition... which root is /dev/sdc5 ...
If you wanting to check root - use sdc5 ..
BUT - if its mounted it wont run on a mounted system....
You can try a force at next boot.. you need to create a file in the root directory...
touch /forcefsck
That's assuming the system boots properly (not to a default shell)..
ELSE you could boot to a LiveUSB, attach the drive with LL and run fsck on the root partition on the usb drive from inside the Live Environment... *note the disk letters may change... sdc may become sdb or sde for example...
Hope that helps ..??...