I just had this exact same bug on a customized Ubuntu 9.04 when installing "oxygen-cursor-theme (0.0.2008-07-07-svn824849-1ubuntu1)"
Error from "sudo aptitude install oxygen-cursor-theme":
update-alternatives: impossible de faire de /usr/share/icons/default/index.theme.dpkg-tmp un lien symbolique vers /etc/alternatives/x-cursor-theme : Aucun fichier ou dossier de ce type
I just had this exact same bug on a customized Ubuntu 9.04 when installing "oxygen- cursor- theme (0.0.2008- 07-07-svn824849 -1ubuntu1) "
Error from "sudo aptitude install oxygen- cursor- theme":
update- alternatives: impossible de faire de /usr/share/ icons/default/ index.theme. dpkg-tmp un lien symbolique vers /etc/alternativ es/x-cursor- theme : Aucun fichier ou dossier de ce type
There was no dependency on xcursor-themes
Installing xcursor-themes resolved the problem.