The bug is that I think it's a standard Ubuntu package which causes the creation of all /root/.rpmdb/ /.rpmdb/ and ~/.rpmdb (i just checked again I have all of them). The .rpmdb directories in the user directories are ok (but I prefer them in a /tmp/ directory if they are in fact temporary. But /.rpmdb/ in the root of the file system is just agains the LSB standard and should NEVER appear as long you only use standard ubuntu packages...
The bug is that I think it's a standard Ubuntu package which causes the creation of all /root/.rpmdb/ /.rpmdb/ and ~/.rpmdb (i just checked again I have all of them). The .rpmdb directories in the user directories are ok (but I prefer them in a /tmp/ directory if they are in fact temporary. But /.rpmdb/ in the root of the file system is just agains the LSB standard and should NEVER appear as long you only use standard ubuntu packages...