Comment 17 for bug 615902

I did the upgrade on a second machine to see more details about the libqt4-help:

During $ sudo apt-get dist-upgrade (no complete output because I have to type this):
[...]
Unpacking replacement libqt4-help ...
dpkg: error processing /var/cache/apt/archives/libqt4-help_4%3a4.7.0~beta2-0ubuntu3~lucid1~ppa4_amd64.deb (--unpack):
 trying to overwrite '/usr/share/qt4/translations/qt_help_cs.qm'. which is also in package libqtcore4 4:4.6.3-0ubuntu1
[...]
Errors where encountered while processing:
 /var/cache/apt/archives/libqt4-help_4%3a4.7.0~beta2-0ubuntu3~lucid1~ppa4_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

ok, now the upgrade is in a broken state, so run $ sudo apt-get -f dist-upgrade
[...]
Errors where encountered while processing:
 /var/cache/apt/archives/libqt4-help_4%3a4.7.0~beta2-0ubuntu3~lucid1~ppa4_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

So, retry the $ sudo apt-get -f dist-upgrade
Now the upgrade will be able to finish.