Update from Dapper to Edgy results in bug

I was running Ubuntu 6.06 LTS on an old Compaq 4090US with 512 MB of RAM. I started an unattended update from Dapper to Edgy and let it run. Seems to work OK. I returned to find that it said to report the following as a bug:

Memory status: size: 28286976 vsize: 0 resident: 28286976 share: 0 rss: 10969088 rss_rlim: 0
CPU usage: start_time: 1164347767 rtime: 0 utime: 1033 stime: 0 cutime:659 cstime: 0 timeout: 374 it_real_value: 0 frequency: 2023

Backtrace was generated from '/usr/bin/update-notifier'

(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(no debugging symbols found)
0xffffe410 in __kernel_vsyscall ()
#0 0xffffe410 in __kernel_vsyscall ()
#1 0xb74d6463 in ?? ()
#2 0xb7f84f58 in ?? ()
#3 0xb7f528e6 in ?? ()
#4 0x0000299c in ?? ()
#5 0xbf8a9aa8 in ?? ()
#6 0x00000000 in ?? ()