kubuntu update-manager crashed during update to 7.04

kubuntu update-manager allocated a huge amount of memory during update from 6.10 to 7.04 and then crashed.

ps auxw | grep adept
root 32544 3.0 51.9 2609788 533240 ? Ss 14:22 1:35 python /tmp/kde-root/adept_updaterwW4Kta.tmp-extract/dist-upgrade.py --frontend DistUpgradeViewKDE

sudo cat /proc/32544/status
Name: python
State: S (sleeping)
SleepAVG: 98%
Tgid: 32544
Pid: 32544
PPid: 1
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 256
Groups: 0
VmPeak: 2609796 kB
VmSize: 2609788 kB
VmLck: 0 kB
VmHWM: 885444 kB
VmRSS: 529936 kB
VmData: 2521236 kB
VmStk: 136 kB
VmExe: 868 kB
VmLib: 51156 kB
VmPTE: 1896 kB
Threads: 1
SigQ: 1/4294967295
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000001001000
SigCgt: 00000001800104aa
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff
Cpus_allowed: ff
Mems_allowed: 1

Traceback (most recent call last):
  File "/tmp/kde-root/adept_updaterwW4Kta.tmp-extract/dist-upgrade.py", line 56, in ?
    app.run()
  File "/tmp/kde-root/adept_updaterwW4Kta.tmp-extract/DistUpgradeControler.py", line 1025, in run
    self.fullUpgrade()
  File "/tmp/kde-root/adept_updaterwW4Kta.tmp-extract/DistUpgradeControler.py", line 1014, in fullUpgrade
    self.doPostUpgrade()
  File "/tmp/kde-root/adept_updaterwW4Kta.tmp-extract/DistUpgradeControler.py", line 740, in doPostUpgrade
    res = self.cache.commit(fprogress,iprogress)
  File "/usr/lib/python2.4/site-packages/apt/cache.py", line 204, in commit
    if res == pm.ResultCompleted:
  File "/usr/lib/python2.4/site-packages/apt/cache.py", line 179, in installArchives
    installProgress.finishUpdate()
  File "/usr/lib/python2.4/site-packages/apt/progress.py", line 206, in run
    select.select([self.statusfd],[],[], self.selectTimeout)
  File "/tmp/kde-root/adept_updaterwW4Kta.tmp-extract/DistUpgradeViewKDE.py", line 227, in fork
    self.child_pid = os.fork()
OSError: [Errno 12] Cannot allocate memory