mixture of GRUB legacy and GRUB 2 after dist-upgrade

[Hans Streibel]

After an upgrade (using the update-manager) from 10.04 (netbook edition)
to 12.04 (development) there seems to be a mixture of GRUB legacy and GRUB 2
packages on my system:

The new 3.x kernels only were incorporated into
    /boot/grub/menu.lst
but the selection shown at boot time obviously is that of
    /boot/grub/grub.cfg
which was not changed during dist upgrade and still only
shows 2.6.x kernels.

My GRUB packages:
hans@netbook:~$ dpkg -l | grep grub
ii grub 0.97-29ubuntu65 GRand Unified Bootloader (Legacy version)
ii grub-common 1.99-14ubuntu2 GRand Unified Bootloader (common files)
rc grub-pc 1.98-1ubuntu6 GRand Unified Bootloader, version 2 (PC/BIOS version)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.155.2.1
ProcVersionSignature: Ubuntu 2.6.32-22.36-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Thu Jan 12 20:35:03 2012
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1325339666
 com.ubuntu.update-manager show-details true
InstallationMedia: Ubuntu-Netbook 10.04 "Lucid Lynx" - Release i386 (20100429.4)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to precise on 2011-12-31 (12 days ago)