im-switch tells me to install a non-existant package

Binary package hint: im-switch

michael@client:~$ im-switch -c

There are 11 candidates which provide IM for /home/michael/.xinput.d/en_HK:

  Selection Alternative
  -----------------------------------------------
 + 1 default
      2 default-xim
      3 ibus
      4 ibus-kde
      5 lo-gtk
      6 none
      7 scim
      8 scim-bridge
* 9 scim-immodule
      10 th-gtk
      11 th-xim
System wide default for en_HK (or all_ALL) locale is marked with [+].
Press enter to keep the current selection[*], or type selection number: 4

Please install following packages:
  "( plasam-widget-kimpanel-backend-ibus )" .
michael@client:~$ sudo apt-get install plasam-widget-kimpanel-backend-ibus
[sudo] password for michael:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package plasam-widget-kimpanel-backend-ibus
michael@client:~$

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: im-switch 1.19
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
Architecture: amd64
Date: Wed May 5 19:52:16 2010
Dependencies:

PackageArchitecture: all
ProcEnviron:
 LANGUAGE=
 PATH=(custom, user)
 LANG=en_HK.UTF-8
 SHELL=/bin/bash
SourcePackage: im-switch