To workaround the problem I have temporarirly linked /bin/true to /usr/sbin/update-grub:
# sudo mount --bind /bin/true /usr/sbin/update-grub
# sudo apt-get dist-upgrade
(installation of kexec-tools completed)
Then grub config update and installation:
# sudo umount /usr/sbin/update-grub
# sudo update-grub
# sudo grub-install /dev/sda
After that everything went fine and 12.04 boots properly.
To workaround the problem I have temporarirly linked /bin/true to /usr/sbin/ update- grub: update- grub update- grub
# sudo mount --bind /bin/true /usr/sbin/
# sudo apt-get dist-upgrade
(installation of kexec-tools completed)
Then grub config update and installation:
# sudo umount /usr/sbin/
# sudo update-grub
# sudo grub-install /dev/sda
After that everything went fine and 12.04 boots properly.