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


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:

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
  • Are you installing gedit from the archives (ie with apt and you haven't added any other repos with gedit)? When you run apt-cache policy gedit, what is the result? The only thing I see online says this happens with gedit 3.4.2, but xenial uses 3.18.3 (disbauxes.upc.es/uncategorized/…). – Larry Price Sep 20 '16 at 18:13
  • @Larry Price: I edited the question – s.ouchene Sep 20 '16 at 18:19
  • You installed an older version. See the removal instructions here and reinstall from the repos. – Jos Sep 20 '16 at 18:22
  • @Jos : Sorry I do not see any instructions there – s.ouchene Sep 20 '16 at 18:25
  • 1
    I will post these instructions as an answer. – Jos Sep 20 '16 at 18:33

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

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