The past couple days I have been getting a disk full error even though I know that it can't be full. I have 1.5TB of space and haven't installed anything nor added more than a couple text files. It has gotten to the point that most Java applications will not run and the classic Gnome panel will not load on login. When I try to start it from terminal I get this error
Code:
** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/activate_window_menu': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/activate_window_menu

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/toggle_maximized': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/toggle_maximized

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/maximize': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/maximize

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/unmaximize': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/unmaximize

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/toggle_shaded': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/toggle_shaded

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/begin_move': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/begin_move

** (gnome-panel:3161): WARNING **: Error getting value for '/apps/metacity/window_keybindings/begin_resize': Type mismatch: Expected `string' got `list' for key /apps/metacity/window_keybindings/begin_resize
Segmentation fault (core dumped)
When I tried to use the disk usage analyser it says that my /home folder contains over 400GB of data but when I look through the sizes of all the files it just doesn't add up. This is making my computer unusable and I really want to avoid reinstalling Ubuntu but as far as I can tell that may be my only option. Any help would be much appreciated.