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[Launchpad Bug Tracker <1306341@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubiquity - 2.18.2

---------------
ubiquity (2.18.2) trusty; urgency=medium

  * Set HOME, because without HOME GtkBuilder upon seeing a FileChooser
    button in the ui file and trying to initialise object for it throws a
    hizzy fit and aborts on an assert, if per-default it's meant to open
    present working directory and it happens to be inaccessible one like
    /root/. (LP: #1306341). This resolves launching Mythubuntu installer
    in a live session using pkexec, back in 12.04 gksudo/sudo was used
    instead.
 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>   Fri, 11 Apr 2014 05:18:42 +0100

** Changed in: ubiquity (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1306341

Title:
  ubiquity / mythbuntu assertion in gtkrecentmanager.c

Status in “gtk+3.0” package in Ubuntu:
  New
Status in “mythbuntu-common” package in Ubuntu:
  Invalid
Status in “ubiquity” package in Ubuntu:
  Fix Released

Bug description:
  Upon loading a .ui file which uses file-chooser-button, under a weird environment:
  - pkexeced, gui_allowed, with PWD not writable

  The following assertion happens:

  (ubiquity:4803): Pango-WARNING **: error opening config file
  '/root/.config/pango/pangorc': Permission denied

  
  (ubiquity:4803): Gtk-CRITICAL **: gtk_radio_button_set_group: assertion '!g_slist_find (group, radio_button)' failed

  (ubiquity:4803): Gtk-CRITICAL **: gtk_radio_button_set_group:
  assertion '!g_slist_find (group, radio_button)' failed

  (ubiquity:4803): Gtk-CRITICAL **: Unable to create user data directory '/root/.local/share' for storing the recently used files list: Permission denied
  **
  Gtk:ERROR:/build/buildd/gtk+3.0-3.10.8/./gtk/gtkrecentmanager.c:617:gtk_recent_manager_set_filename: assertion failed: (priv->filename != NULL)

  Which core-dumps ubiquity.

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