Problem with gedit

Question

I am using ubuntu 16.04 LTS.
gedit does not start when I type in the terminal:

gedit

I do get the following error:

(gedit:9955): GLib-GIO-ERROR **: Settings schema 'org.gnome.gedit.preferences.ui' does not contain a key named 'notebook-show-tabs-mode' Trace/breakpoint trap (core dumped)

I googled this but nothing fixed the problem (I tried to remove then install it...etc)

When I run:

apt-cache policy gedit

I do get:

gedit:
Installed: 3.18.3.is.really.3.10.4-0ubuntu13
Candidate: 3.18.3.is.really.3.10.4-0ubuntu13
Version table:
*** 3.18.3.is.really.3.10.4-0ubuntu13 500
    500 http://ppa.launchpad.net/mc3man/older/ubuntu xenial/main amd64 Packages
    100 /var/lib/dpkg/status
 3.18.3-0ubuntu4 500
    500 http://dz.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

Answer 1

For some reason, you installed gedit from an obscure ppa (called ppa:mc3man/older), instead of from the official repositories.

First, remove the references to the ppa. The easiest way to do that is to install a program called ppa-purge:

sudo apt install ppa-purge

then use it to remove the offending ppa:

sudo ppa-purge ppa:mc3man/older

Then the package sources need to be updated:

sudo apt update

and the official gedit can be installed:

sudo apt install --reinstall gedit

Done. The last two commands will now probably succeed, so I combined them into one line using the && directive. This means: do the first command, then if successful, do the second command.

sudo apt update && sudo apt install --reinstall gedit