do-release-upgrade fails

The server upgrade (text only, no graphics) from 10.10 to 11.04 fails after building the data structures. One more thing which may be related: After installing or upgrading existing files (not sure which or when) the text on the monitor (messages and login prompt) attached to the system got real small and the keyboard became unresponsive. It all works fine in the BIOS setup. I'm not sure when or how it happened because I access the server through ssh or webmin and can still do so. I suspect a corrupted keyboard or video driver but I'm not sure what to look for. Any ideas on that regard would be helpful.

These problems might be fixed with the release upgrade. Since ssh is not recommended I issued the command through webmin's command shell module and got the following error messages. How about this: can I safely upgrade via an installation cd?

---------------------------
error messages:

Building data structures... Done
Error in function start

A fatal error occurred

Please report this as a bug and include the files
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in
your report. The upgrade has aborted.
Your original sources.list was saved in
/etc/apt/sources.list.distUpgrade.

Traceback (most recent call last):

File "/tmp/update-manager-b7Fgky/DistUpgradeView.py", line 111, in
start
super(FetchProgress, self).start()

File "/usr/lib/python2.6/dist-packages/apt/progress/text.py", line
105, in start
self._winch()

File "/usr/lib/python2.6/dist-packages/apt/progress/text.py", line
113, in _winch
buf = fcntl.ioctl(self._file, termios.TIOCGWINSZ, 8 * ' ')

IOError: [Errno 22] Invalid argument

-----------------------------------
main.log follows:

2011-06-09 06:25:09,253 INFO Using config files '['./DistUpgrade.cfg']'
2011-06-09 06:25:09,253 INFO uname information: 'Linux webserver 2.6.35-28-generic-pae #50-Ubuntu SMP Fri Mar 18 20:43:15 UTC 2011 i686'
2011-06-09 06:25:09,254 INFO release-upgrader version '0.150.2' started
2011-06-09 06:25:09,274 INFO screen could not be run
2011-06-09 06:25:09,274 DEBUG Using 'DistUpgradeViewText' view
2011-06-09 06:25:09,361 DEBUG aufsOptionsAndEnvironmentSetup()
2011-06-09 06:25:09,363 DEBUG using '/tmp/upgrade-rw-R5I8Mq' as aufs_rw_dir
2011-06-09 06:25:09,363 DEBUG using '/tmp/upgrade-chroot-AiA67r' as aufs chroot dir
2011-06-09 06:25:09,363 DEBUG enable dpkg --force-overwrite
2011-06-09 06:25:09,394 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'
2011-06-09 06:25:15,915 DEBUG lsb-release: 'maverick'
2011-06-09 06:25:15,916 DEBUG _pythonSymlinkCheck run
2011-06-09 06:25:15,917 DEBUG openCache()
2011-06-09 06:25:17,172 DEBUG /openCache(), new cache size 32303
2011-06-09 06:25:17,173 DEBUG needServerMode(): can not find a desktop meta package or key deps, running in server mode
2011-06-09 06:25:17,173 DEBUG checkViewDepends()
2011-06-09 06:25:17,174 DEBUG running doUpdate() (showErrors=False)
2011-06-09 06:25:17,218 ERROR not handled exception:
Traceback (most recent call last):

  File "/tmp/update-manager-b7Fgky/DistUpgradeView.py", line 111, in start
    super(FetchProgress, self).start()

  File "/usr/lib/python2.6/dist-packages/apt/progress/text.py", line 105, in start
    self._winch()

  File "/usr/lib/python2.6/dist-packages/apt/progress/text.py", line 113, in _winch
    buf = fcntl.ioctl(self._file, termios.TIOCGWINSZ, 8 * ' ')

IOError: [Errno 22] Invalid argument

2011-06-09 06:25:17,223 DEBUG enabling apt cron job

-----------------------------
apt.log follows:

Log time: 2011-06-09 06:25:16.882770