Reverting linux-image-2.6.20-14-generic_2.6.20-14.23 to linux-image-2.6.20-14-generic_2.6.20-14.22 fixes this problem.
Reverting linux-image- 2.6.20- 14-generic_ 2.6.20- 14.23 to linux-image- 2.6.20- 14-generic_ 2.6.20- 14.22 fixes this problem.