Linux mint black screen after installing extension

Question

I have been running my linux without problems up until now and when I tried to install specific extension, everything but my mouse cursor was frozen. Restarting my PC didn't do any good - black screen and system unable to start its desktop environment.

Running startx does nothing - black screen with my cursor only visible.

Running sudo cinnamon --replace gives me the following output:

error: XDG_RUNTIME_DIR not set in the environment.
Window manager error: Unable to open X display 

I ran the following command:

egrep -i 'error|fail' ~/.xsession-errors

which gave me the following output:

** (nm-applet:2907): CRITICAL **: nm_secret_agent_register: assertion 'priv->registered == FALSE' failed
[WARN 18:56:42.705382] [relevancy-backend-zg:63] Unable to check Zeitgeist data sources: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files
[WARN 18:56:42.708795] [relevancy-backend-zg:123] GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files
[WARN 18:56:42.708885] [relevancy-backend-zg:209] GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files

Along with this line which is repeated at least 30 times

Window manager warning: Log level 8: meta_screen_get_monitor_geometry: assertion 'monitor >= 0 && monitor < screen->n_monitor_infos' failed

ending with this:

(cinnamon:2893): Cjs-WARNING **: JS ERROR: InternalError: too much recursion
Window manager warning: Log level 8: meta_screen_get_monitor_geometry: assertion 'monitor >= 0 && monitor < screen->n_monitor_infos' failed
(cinnamon:2893): Cjs-WARNING **: JS ERROR: (null)
(cinnamon:2893): Cjs-WARNING **: JS ERROR: (null)
(cinnamon:2893): Cjs-WARNING **: JS ERROR: (null)

Or to put everything as one:

** (nm-applet:2907): CRITICAL **: nm_secret_agent_register: assertion 'priv->registered == FALSE' failed
[WARN 18:56:42.705382] [relevancy-backend-zg:63] Unable to check Zeitgeist data sources: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files
[WARN 18:56:42.708795] [relevancy-backend-zg:123] GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files
[WARN 18:56:42.708885] [relevancy-backend-zg:209] GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.zeitgeist.Engine was not provided by any .service files
Window manager warning: Log level 8: meta_screen_get_monitor_geometry: assertion 'monitor >= 0 && monitor < screen->n_monitor_infos' failed
(cinnamon:2893): Cjs-WARNING **: JS ERROR: InternalError: too much recursion
Window manager warning: Log level 8: meta_screen_get_monitor_geometry: assertion 'monitor >= 0 && monitor < screen->n_monitor_infos' failed
(cinnamon:2893): Cjs-WARNING **: JS ERROR: (null)

Purging and installing cinnamon again lead to no result as well.

• The extension I tried to install is Panel span
• I am using Linux Mint with Cinnamon
• Cinnamon version is 2.6.13
• My Mint version is 17.2 - Rafaela

Any kind of help or advice would be greatly appreciated!