Problem with upgrade of Lubuntu 11.10 to 12.04

Alex Lam S.L. alexlamsl at
Mon Jun 18 18:10:21 UTC 2012

Hi there,

This seems to be a problem with Ubuntu rather than Lubuntu, which
relies on the packages provided by the former.

Either case, looking at the package information, "qjackctl" seems very
much alive:

And they seem to be of exact same version between 11.10 (oneiric) and
12.04 (precise).

I have also tried installing the package on my system by (under LXTerminal):

  $> sudo apt-get install qjackctl
  Need to get 14.5 MB of archives.
  After this operation, 51.5 MB of additional disk space will be used.
  Do you want to continue [Y/n]?

So I can't see immediately where the problem is; the system I have
tested on is a fresh install (instead of an upgrade), but I doubt if
that would cause any differences.

Please try the command above - report back with any error messages if
it fails to install the package.


On Mon, Jun 18, 2012 at 6:43 PM, Aere Greenway
<Aere at> wrote:
> All:
> In testing the upgrade of one of my MIDI-Music systems from Lubuntu 11.10
> to Lubuntu 12.04, I encountered a serious problem, and in spite of hours of
> trying, I have been unable to find any way to report the problem (where it
> does not actually cause a crash).
> The problem is that the upgrade process for Lubuntu (this problem does not
> occur in the Ubuntu upgrade), the package "qjackctl" is marked obsolete, and
> in doing so, after the upgrade, there is no way (that I know of) to
> re-install it (get it back).
> The "qjackctl" package is an essential component for people using MIDI
> music software.  Its absence renders the system useless (or much degraded)
> for doing MIDI music.  For example, if you use the Rosegarden
> sequence-editor, you can no longer use audio files in your projects.
> I have been using qjackctl successfully since I started using Lubuntu, and
> continue to use it without problems on 12.04 (from a fresh-install).  Given
> this experience, I find it hard to believe that its presence & use causes
> problems in Lubuntu.
> This applies to slower, lower-memory machines (which I always test with on
> every new level).  I have not had problems with qjackctl, even on a 450
> megahertz, 384 megabytes ram machine.
> If qjackctl is no longer allowed on Lubuntu, I will be compelled to
> abandon the Lubuntu distribution, since MIDI music is most of what I do.
> Can someone please give me more information on this?  Is there any way to
> get back qjackctl after it has been marked obsolete?  Why does the upgrade
> need to declare qjackctl to be obsolete?
> Thanks in advance for your response.
> --
> Sincerely,
> Aere
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