First - I will try to provide as much info as possible, but I received my computer as a gift, so I am not the most computer savvy...
I am running Ubuntu on a partitioned Chromebook, for the last...2+ years? no major issues. Now, I was watching a movie from the external hard drive and mid-transmission, it stopped, I received an error message that it could no longer source the file and the hard drive was no longer visible, although the light on the hard drive was still on. I KNOW THIS WAS BAD, but I unplugged it and tried to plug it in again - to no avail.
Fast forward to next day, still no luck, I try running some commands to force it to mount, but it doesn't even "see" it. So I restart my computer with the hard drive plugged in. When it restarts, several things happen:
-the hard drive light is no longer on, but I hear whirring/clicking from inside -the font of my computer is different - like the numbers of the clock, etc -the power indicator is no longer visible next to the other icons
I tried to address the power indicator issue, trying various things to install, purge, reinstall, etc etc. It goes through some processes but there is always some kind of error indicated. Most recently, this:
E: Failed to fetch http://fr.archive.ubuntu.com/ubuntu/pool/main/ii/indicator-power/indicator-power_12.10.6+15.04.20150402-0ubuntu1_amd64.deb Size mismatch
It suggests running
apt-get update or to try --fix missing.
When I run the update command I end up with
E: GPG error: http://dl.google.com stable InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)
And I don't know what any of that means...
So I can't figure out what the issue is with the power indicator, I'm getting all kinds of messages...the font has changed which also worries me that there's something going on that I'm not aware of, and I have a lot of very important material on my external hard drive that I really need access to! Additionally - I am working abroad at the moment with limited access to assistance, which is why I need to try and fix this on my own.
Any and all suggestions are appreciated. Thank you!
EDIT: I am wondering if I should try to mount my hard drive on another computer - I do not know anyone who runs any Linux system here, so I'm not sure if that matters. Also, if there is somehow something on my hard drive that infected my computer, I wouldn't want to pass that along (not even sure if that's possible here...)
EDIT 2: I am trying to fix the font issue, tried to install the unity tweak tool, but I get a similar error as above of a "Size Mismatch" - I've never seen this before - what does it mean and how can I address it?
EDIT 3: I fully shutdown computer and started (without hard drive plugged in) and the font has returned to normal and power-indicator is back - does this mean there is an issue affecting my computer from the hard drive itself?