try booting the Mint live usb. it will let you examine the partitions and filesystem details of your installed OS
#Mint failed to load due to GNOME
shut wagon
launch the DISKS app from live mode, select the internal drive, and each partition on it, one at time, clicking the play icon to mount each
it will indicate space used / free on each partition
regal cedar
try booting the Mint live usb. it will let you examine the partitions and filesy...
i dont have a usb
shut wagon
try to set one up.