G'day Nicolas.
In that last screenshot you have an error with the command. You have to specify the device properly.
Try the following
Code:
sudo mount /dev/sda4 /mnt
cd /mnt
ls
That last command is l for Lima, s for Sierra - it means to list files and folders contained there.
If you get an output there, perhaps show us a screenshot.
Do I take it correctly that the 60GB valuable data is all contained in Downloads? And you said it is in NTFS.
While you are in the mounted environment, you can issue the command
When that has completed, there will be a human readable figure at bottom left that might say 60G - write that exact figure down.
Next is to see if the partition /dev/sda4 is intact and working OK, if so you can get the data from it.
First we have to leave the mounted environment.
Even though we are unmounting, the word is umount.
Now we want to run a program that will check that file system for errors and if found, fix them. Under a Linux environment we would usually use
fsck
but we can't with the NTFS so it will need something like
ntfsfix
which means installing, in your Live session
ntfsprogs
BUT (and Wizard's but is seldom far behind him), you may wish to transfer and safeguard the data first and then check it, so depending on the size identified with that
du -ah
command above, maybe get yourself a 64 GB USB stick or similar, and transfer it.
See how you go.
Chris Turner
wizardfromoz