I have a newly installed Ubuntu Server 9.10 amd64 in VMware Server and I want to upgrade it to latest build of lucid.
Updates installed correctly but update-manager reported that system now is in unstable state and i have to report a bug :)

root@app:/var/log/dist-upgrade# cat apt.log
Log time: 2010-02-21 17:30:32.724435
Log time: 2010-02-21 17:30:36.446468
Log time: 2010-02-21 17:33:30.408783
  Installing libdevmapper1.02.1 as Depends of dmsetup
  Installing libk5crypto3 as Depends of libkrb5-3
  Installing libkrb5support0 as Depends of libkrb5-3
  Installing gcc-4.4-base as Depends of libstdc++6
  Installing libbz2-1.0 as Depends of bzip2
  Installing tomcat6 as Depends of tomcat6-docs
    Installing tomcat6-common as Depends of tomcat6
      Installing libtomcat6-java as Depends of tomcat6-common
        Installing libservlet2.5-java as Depends of libtomcat6-java
  Installing libc6 as Depends of iproute
  Installing libdb4.8 as Depends of iproute
  Installing python2.6-minimal as Depends of python-minimal
    Installing libssl0.9.8 as Depends of python2.6-minimal
  Installing libglib2.0-0 as Depends of libglib2.0-data
  Installing libdevmapper-event1.02.1 as Depends of lvm2
  Installing linux-image-virtual as Depends of linux-virtual
  Setting NOT as auto-installed (direct Depends of pkg in APT::Never-MarkAuto-Sections)
    Installing linux-image-2.6.32-14-virtual as Depends of linux-image-virtual
    Setting NOT as auto-installed (direct Depends of pkg in APT::Never-MarkAuto-Sections)
  Installing perl-base as Depends of perl
  Installing perl-modules as Depends of perl
  Installing libept0 as Depends of aptitude
  Installing openjdk-6-jre-headless as Depends of icedtea-6-jre-cacao
    Installing openjdk-6-jre-lib as Depends of openjdk-6-jre-headless
  Installing netcat-openbsd as Depends of ubuntu-minimal
  Setting NOT as auto-installed (direct Depends of pkg in APT::Never-MarkAuto-Sections)
  Installing ureadahead as Depends of ubuntu-minimal
  Setting NOT as auto-installed (direct Depends of pkg in APT::Never-MarkAuto-Sections)
    Installing libnih1 as Depends of ureadahead
  Installing libsqlite3-0 as Depends of python2.6
  Installing e2fslibs as PreDepends of e2fsprogs
  Installing grub-common as Depends of grub-pc
    Installing gettext-base as Depends of grub-common
  Installing libudev0 as Depends of udev
  Installing initramfs-tools as Depends of udev
    Installing initramfs-tools-bin as Depends of initramfs-tools
      Installing libnih-dbus1 as PreDepends of mountall
      Installing libplymouth2 as PreDepends of mountall
        Installing libpng12-0 as Depends of libplymouth2
  Installing diffutils as PreDepends of diff
  Installing tzdata as Depends of tzdata-java
  Installing sensible-utils as Depends of debianutils
  Installing libmagic1 as Depends of file
  Installing dhcp3-common as Depends of dhcp3-client
  new important dependency: libsasl2-modules
  Installing libsasl2-modules as Recommends of libsasl2-2
  new important dependency: gnupg-curl
  Installing gnupg-curl as Recommends of gnupg
Starting
Starting 2
Done

root@app:/var/log/dist-upgrade# tail -20  main.log
2010-02-21 17:33:59,489 DEBUG disabling apt cron job (0755)
2010-02-21 18:20:29,482 DEBUG plugins for condition 'StartUpgrade' are '[]'
2010-02-21 18:20:29,483 DEBUG plugins for condition 'lucidStartUpgrade' are '[]'
2010-02-21 18:20:29,484 DEBUG plugins for condition 'from_karmicStartUpgrade' are '[]'
2010-02-21 18:20:29,484 DEBUG quirks: running StartUpgrade
2010-02-21 18:20:29,484 DEBUG skipping 'README' (no '.')
2010-02-21 18:20:29,484 DEBUG check if patch '_usr_sbin_install-docs.3533d3b8e8f08f78c95550a7edcbe316' needs to be applied
2010-02-21 18:20:29,484 DEBUG check if patch '_usr_sbin_install-docs.268d21f1f1ed5f7a19fffef645ac4d52' needs to be applied
2010-02-21 18:20:29,485 INFO cache.commit()
2010-02-21 18:20:29,486 DEBUG failed to SystemUnLock() (E:Not locked)
2010-02-21 18:20:29,609 ERROR Exception during pm.DoInstall()
Traceback (most recent call last):
  File "/tmp/tmpE9P2Xh/DistUpgradeView.py", line 182, in run
    res = pm.DoInstall(self.writefd)
SystemError: E:Couldn't configure pre-depend libplymouth2 for mountall, probably a dependency cycle.
2010-02-21 18:20:29,677 ERROR SystemError from cache.commit(): installArchives() failed
2010-02-21 18:20:29,678 DEBUG can't find apport
2010-02-21 18:20:29,757 DEBUG enabling apt cron job
2010-02-21 18:20:29,759 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
2010-02-21 18:20:29,840 DEBUG enabling apt cron job