All applications in my Ubuntu 16.04 seem to lost track of their user data.

When I launch firefox, none of my bookmarks/browsing history are present. Launching chromium-browser from the terminal shows:

[3558:3558:1111/200649:ERROR:process_singleton_posix.cc(966)] Failed to create socket directory. [3558:3558:1111/200649:ERROR:chrome_browser_main.cc(1516)] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption

and fails to launch.

The dash shows

There's nothing that matches your search

MEGAsync has shown a pop-up window asking for login details, whereas it used to automatically sync my files with the cloud(it was logged in and I never used to require to login again).

When I googled around, I got an idea that all the application data stored for this particular user that I'm logged in inside Ubuntu might have been lost, but when I showed the hidden files in my home folder, I found all of them intact at their usual locations. For example, about:profiles in firefox shows its Root directory as /home/user/.mozilla/firefox/73h5bi5y.default which is intact with data of the browsing history and extensions.

I got this problem abruptly while I was using my computer. I had just chosen to restart firefox, and it opened up with a blank bookmarks bar, no history and no passwords. Even synapse search isn't working as it has lost all of its indexed data of files and folders across all partitions.

UPDATE:: I tried downloading a small image from firefox, and it said:

There is not enough room on the disk to save . Remove unnecessary files from the disk and try again, or try saving in a different location.

When I right clicked into my home directory, it showed zero bytes of free space. That's not true. I don't know how to prove that as I'm not able to access Disk Management through Dash as it's not showing any applications/its search ain't working.

Here's the output to df -h : enter image description here

  • please, open a terminal and enter 'df -h' add the output to your question. – Phillip -Zyan K Lee- Stockmann Nov 11 '16 at 16:40
  • @Phillip-ZyanKLee-Stockmann I have added the output – scienceauror Nov 11 '16 at 18:32
  • is one of /home or /home/user a symlink to either /mn/8CA0FE5AA0FE49EA, /think, /mash or /cargo? or is it placed on / - all of those mount points are (nearly/completely) full. – Phillip -Zyan K Lee- Stockmann Nov 11 '16 at 18:41
  • no, the disk spaces of other drives are correct. One thing that has come to my notice, is how for /dev/sda4 it shows a size of 32G and used 30G, with 0 Available. The data for the other directories/folders is believable atleast, as Avail = Size - Used. – scienceauror Nov 11 '16 at 19:37
  • 2GB may be used by metadata through the filesystem. which filesystem is it? usage/free reported by df for btrfs partitions for example is not even close to its real usage/free status. if you are still in doubt, run fsck for the partitions. – Phillip -Zyan K Lee- Stockmann Nov 11 '16 at 19:39

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