this error appears only when you download the deb file from the site and try to install it .
try sudo apt-get install ubuntu-tweak
Error: Dependency is not satisfiable: python-aptdaemon.gtk3widgets
Python GTK+ 3 widgets to run an aptdaemon client
Aptdaemon is a transaction based package management daemon. It allows
normal users to perform package management tasks, e.g. refreshing the
cache, upgrading the system, installing or removing software packages.
normal users to perform package management tasks, e.g. refreshing the
cache, upgrading the system, installing or removing software packages.
epends on:
aptdaemon-data
gir1.2-gtk-2.0
gir1.2-vte-0.0
python (>= 2.7.1-0ubuntu2)
python (<< 2.8)
python-aptdaemon (= 0.41+bzr646-0ubuntu2)
python-gobject (>= 2.27.91)
python2.7
sudo apt-get install python-aptdaemon.gtk3widgets
E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
[above error due to package installer being open]
sudo apt-get install python-aptdaemon.gtk3widgets
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package python-aptdaemon.gtk3widgets
sudo apt-get install python-aptdaemon.gtk3widgets_0.41+bzr646-0ubuntu2_all.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package python-aptdaemon.gtk3widgets_0.41+bzr646-0ubuntu2_all.deb
python-aptdaemon.gtk3widgets_0.41+bzr646-0ubuntu2_all.deb
Error: Dependency is not satisfiable: python2.7