Software center does not open after update

Question

I had installed beta version of Freya alongside windows 7 about a year ago. I didn't use or update Freya after a month of use. But today I updated it by apt-get update && apt-get upgrade and also from software updater. Now, after that process, software center does not open by clicking the icon. All other apps work normally. Any suggestions?

Edit: When I open it from terminal, it says:

** (software-center:9741): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-wwFmjNgyPS: Connection refused
2015-10-25 23:09:13,460 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
Traceback (most recent call last):
File "/usr/bin/software-center", line 130, in <module>
app = SoftwareCenterAppGtk3(options, args)
File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 407, in __init__
self.icons)
File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/historypane.py", line 79, in __init__
self._get_emblems(self.icons)
File "/usr/share/software-center/softwarecenter/ui/gtk3/panes/historypane.py", line 199, in _get_emblems
pb = icons.load_icon(emblem, self.ICON_SIZE, 0)
gi._glib.GError: Error opening file: No such file or directory

Answer 1

it can't find a missing icon, for me its: /usr/share/icons/elementary/actions/16/package-install.svg

FIX

edit file: /usr/share/icons/default/index.theme and make sure "Inherits=" line includes icon theme that contains this missing iconm, eg:

Inherits=elementary,Humanity

Answer 2

Depending on your theme (mine was Pacifica), it was missing the actions icons.

To solve the errors (see first post above) you need to copy the missing icons from the Humanity icontheme:

Example in terminal (create directory, copy files):

sudo mkdir /usr/share/icons/Pacifica/16x16/actions

sudo cp -rp /usr/share/icons/Humanity/actions/16/* ../../../Pacifica/16x16/actions

Just in case, copy all possible sizes based on the target icontheme. After that, just start software center via "Applications > System Tools".

Works fine.

Answer 3

Removing Software Centre's cache could help:

killall software-center
sudo rm -r /var/cache/software-center/xapian
sudo mv /var/lib/dpkg/info/format /var/lib/dpkg/info/format.bak
sudo dpkg --clear-avail
sudo apt-get update
sudo apt-get install --reinstall software-center

The first command should return software-center: no process found

From the comment by OP, The problem solved after re-installing both the themes.

sudo apt-get install --reinstall humanity-icon-theme elementary-icon-theme