package fastjar 2:0.95-1ubuntu2.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 2

[Robert Cady]

Binary package hint: fastjar

After upgrading to Ubuntu 10.04, fastjar failed to load properly. This means that I can't use Computer Janitor to clean my disk and get needed free space.

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: fastjar 2:0.95-1ubuntu2.1
ProcVersionSignature: Ubuntu 2.6.32-25.45-386 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-386 i686
Architecture: i386
Date: Fri Nov 5 10:44:06 2010
ErrorMessage: subprocess new pre-removal script returned error exit status 2
SourcePackage: fastjar
Title: package fastjar 2:0.95-1ubuntu2.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 2

[Matthias Klose (doko)]

Preparing to replace fastjar 2:0.95-1ubuntu2.1 (using .../fastjar_2%3a0.98-1ubuntu0.10.04.1_i386.deb) ...
Can't call method "slave" on an undefined value at /usr/sbin/update-alternatives line 1037.
dpkg: warning: old pre-removal script returned error exit status 2
dpkg - trying script from the new package instead ...
Can't call method "slave" on an undefined value at /usr/sbin/update-alternatives line 1037.
dpkg: error processing /var/cache/apt/archives/fastjar_2%3a0.98-1ubuntu0.10.04.1_i386.deb (--unpack):
 subprocess new pre-removal script returned error exit status 2

how does the alternatives database look like?
$ cat /var/lib/dpkg/alternatives/jar

[Launchpad Janitor (janitor)]

[Expired for fastjar (Ubuntu) because there has been no activity for 60 days.]