Comment 16 for bug 194140

This issue is still present in Karmic alpha 4:

$ LC_ALL=C sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  lxde-settings-daemon
The following packages will be upgraded:
  evince libaprutil1 libevdocument1 libevview1 libsasl2-2 libsasl2-modules
6 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B/1341kB of archives.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? y
E: Internal Error, Could not perform immediate configuration (2) on libsasl2-2

$ LC_ALL=C sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  lxde-settings-daemon
The following packages will be upgraded:
  evince libaprutil1 libevdocument1 libevview1 libsasl2-2 libsasl2-modules
6 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B/1341kB of archives.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? y
E: Internal Error, Could not perform immediate configuration (2) on libsasl2-2

I'm starting to think that it might be a good idea to duplicate this bug and assign it to APT as a 100 Paper Cut bug, because that error message (2) doesn't tell the user anything useful. That number (2) should be replaced with a proper explanation of what's preventing apt-get from upgrading the packages.