When booting from the install-CD, there is not enough space for vgscan to write /etc/lvmtab and /etc/lvmtab.d To get enough space I had to delete ssh, scp and /etc/pcmcia... It seems that vgscan needs about 512KB free space on /etc... Please make the RAM-disk just a little bit bigger, or UPX-compress the binaries or something..
*** This bug has been marked as a duplicate of 275 ***