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nm-applet seems to have disappeared from my system. I am running 12.10. Here's what I get when I check my package manager logs:

☁  ~  grep network-manager /var/log/dpkg.log                
2012-10-06 10:37:08 upgrade network-manager-gnome:amd64 0.9.6.2-0ubuntu5 0.9.6.2-0ubuntu6
2012-10-06 10:37:08 status half-configured network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:08 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:09 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu5
2012-10-06 10:37:09 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-06 10:37:09 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-06 10:39:50 configure network-manager-gnome:amd64 0.9.6.2-0ubuntu6 
2012-10-06 10:39:50 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-06 10:39:50 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-06 10:39:50 status half-configured network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-06 10:39:50 status installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 remove network-manager-gnome:amd64 0.9.6.2-0ubuntu6 
2012-10-28 22:27:23 status half-configured network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status config-files network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-28 22:27:23 status config-files network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 install network-manager-gnome:amd64 0.9.6.2-0ubuntu6 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status half-installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:03 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:06 configure network-manager-gnome:amd64 0.9.6.2-0ubuntu6 
2012-10-31 19:58:06 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:07 status unpacked network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:07 status half-configured network-manager-gnome:amd64 0.9.6.2-0ubuntu6
2012-10-31 19:58:07 status installed network-manager-gnome:amd64 0.9.6.2-0ubuntu6
☁  ~

Unfortunately, I cannot find network-manager-applet package at all:

☁  ~  apt-cache search network-manager-applet
☁  ~

Here are the contents of /etc/apt/sources.list:

☁  ~  cat /etc/apt/sources.list
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/main/binary-i386/

# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ dists/precise/restricted/binary-i386/
# deb cdrom:[Ubuntu 12.04 LTS _Precise Pangolin_ - Release amd64 (20120425)]/ precise main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ quantal main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://gb.archive.ubuntu.com/ubuntu/ quantal-updates main restricted
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ quantal universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal universe
deb http://gb.archive.ubuntu.com/ubuntu/ quantal-updates universe
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://gb.archive.ubuntu.com/ubuntu/ quantal multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal multiverse
deb http://gb.archive.ubuntu.com/ubuntu/ quantal-updates multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://gb.archive.ubuntu.com/ubuntu/ quantal-backports main restricted universe multiverse
deb-src http://gb.archive.ubuntu.com/ubuntu/ quantal-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu quantal-security main restricted
deb-src http://security.ubuntu.com/ubuntu quantal-security main restricted
deb http://security.ubuntu.com/ubuntu quantal-security universe
deb-src http://security.ubuntu.com/ubuntu quantal-security universe
deb http://security.ubuntu.com/ubuntu quantal-security multiverse
deb-src http://security.ubuntu.com/ubuntu quantal-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu precise partner
# deb-src http://archive.canonical.com/ubuntu precise partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu quantal main
deb-src http://extras.ubuntu.com/ubuntu quantal main
☁  ~ 

Right now, I can't think of anything else. Happy to provide more info upon request.

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2 Answers 2

up vote 1 down vote accepted

What you could try is to reinstall your Ubuntu session. This won't delete any settings or personal data, just reinstall Unity and its packages. Just run this in terminal:

sudo apt-get install --reinstall ubuntu-desktop

If that doesn't work, re-install ubuntu-desktop metapackage and reinstall its dependencies (packages). Use this command:

sudo apt-cache depends ubuntu-desktop | awk -F ":" '{print $2}' | sed '/^$/d' | xargs sudo apt-get install --reinstall --install-recommends --yes
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Seems to have done the trick. Thanks! –  welp Nov 1 '12 at 5:39
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The answer is kind of weird. Because you have tried the right things to reset unity.

Lets try once again,

Press Alt+Ctrl+F1, login and then enter these commands one by one.

sudo lightdm stop

gconftool-2 --recursive-unset /apps/compiz-1

unity --reset-icons

unity --reset

Have you played with any config file, x org configuration last time?

sudo reboot now

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