Public bug reported:

Binary package hint: grub2

Expected: to see a grub menu proposing to choose between linux kernels, which 
one to boot
Actual: the latest kernel boots (but there's an unbearable bug, so I want a 
downgrade).
I tried System->Preferences and System->Administration, it seems there are no 
relevant items.

The story from the beginning:
I use Sun Virtual box, 32-bit guest maverick under a 64-bit host maverick.
After my agreeing to some updates, the linux in the VM hangs, ignoring the 
keyboard but seeing the mouse.
It was not this way before.
I decided to use an older kernel, since it used to work, but cannot find a way 
to boot under it.
There is only one OS, Ubuntu under the VM, but there are multiple kernels:
$ ls -l /boot/vmlinuz-2.6.35-*
-rw-r--r-- 1 root root 4289616 2010-10-17 06:02 /boot/vmlinuz-2.6.35-22-generic
-rw-r--r-- 1 root root 4294672 2011-01-22 01:04 /boot/vmlinuz-2.6.35-25-generic
-rw-r--r-- 1 root root 4294640 2011-02-23 03:50 /boot/vmlinuz-2.6.35-27-generic
-rw-r--r-- 1 root root 4294704 2011-03-01 18:43 /boot/vmlinuz-2.6.35-28-generic


$ uname -a
Linux wieloryb 2.6.35-28-generic #49-Ubuntu SMP Tue Mar 1 14:40:58 UTC 2011 
i686 GNU/Linux

$ lsb_release -rd
Description:    Ubuntu 10.10
Release:        10.10
$ apt-cache policy grub2
grub2:
  Installed: (none)
  Candidate: 1.98+20100804-5ubuntu3
  Version table:
     1.98+20100804-5ubuntu3 0
        500 http://ru.archive.ubuntu.com/ubuntu/ maverick/universe i386 Packages

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 2.6.35-28.49-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic i686
Architecture: i386
Date: Wed Mar 23 17:50:37 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: grub2

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 maverick

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https://bugs.launchpad.net/bugs/741043

Title:
  no grub2 prompt after updates

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