Kubuntu Karmic Koala (9.10) Qt: 4.5.2 KDE: 4.3.2 (KDE 4.3.2)
and
Kubuntu Lucid Lynx (10.04) Alpha 1 Qt: 4.6.0 KDE Development Platform: 4.3.85 (KDE 4.3.85 (KDE 4.4 Beta2))
Both have this bug.
A workaround is to rename (disable) the /usr/share/icons/default/index.theme. Then the KDE Classic is the default theme. Bug - https://bugs.launchpad.net/ubuntu/+source/kde4libs/+bug/305201
Then it is possible to use the Bluecurve icon theme (at here).
Kubuntu Karmic Koala (9.10)
Qt: 4.5.2
KDE: 4.3.2 (KDE 4.3.2)
and
Kubuntu Lucid Lynx (10.04) Alpha 1
Qt: 4.6.0
KDE Development Platform: 4.3.85 (KDE 4.3.85 (KDE 4.4 Beta2))
Both have this bug.
A workaround is to rename (disable) the /usr/share/ icons/default/ index.theme. Then the KDE Classic is the default theme. Bug - https:/ /bugs.launchpad .net/ubuntu/ +source/ kde4libs/ +bug/305201
Then it is possible to use the Bluecurve icon theme (at here).