Comment 2 for bug 192777

I searched Ubuntu Installation and Upgrade forum with the word "committing" and found a couple of items related. The problem is apparently fairly common.
The answer was to manually run dpkg in a terminal.

Somehow file qt_plugins_3.3rc is messed up and simply entering "dpkg --configure -a" as superuser finds the problem and fixes it. See the command line below.
The sequence asks "What would you like to do about it?" enter "Y" or "I" to install the package maintainer's version and it just goes.
It installs the file/package and Adept and other installers are happy again.

You can get a bit more info by doing "man dpkg" and looking for the "--configure" parameter.

> $ sudo dpkg --configure -a
> Setting up libc6 (2.6.1-1ubuntu10) ...
>
> Setting up libqt3-mt (3:3.3.8really3.3.7-0ubuntu11.1) ...
>
> Configuration file `/etc/qt3/qt_plugins_3.3rc'
> ==> File on system created by you or by a script.
> ==> File also in package provided by package maintainer.
> What would you like to do about it ? Your options are:
> Y or I : install the package maintainer's version
> N or O : keep your currently-installed version
> D : show the differences between the versions
> Z : background this process to examine the situation
> The default action is to keep your current version.
> *** qt_plugins_3.3rc (Y/I/N/O/D/Z) [default=N] ?