Comment 3 for bug 653571

As reported in duplicate bug 834480 I had this appear while testing the i386-20110825 Lubuntu image after selecting "install this third party software" and clicking on continue. I had both checked the md5sum and also used the "check CD for defects" option before booting to the live desktop.

I restarted the installation w/o even rebooting and this time unchecked the "install this third party software" box and the installation completed successfully.

Perhaps unrelated but I'd also had a jockey-backend crash before starting the initial installation as reported in bug 831754.