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But RC 32-bit installed without problems
As I could successfully install the 64bit and 32bit RCs in virtualbox it could be a problem with a broken iso for the 64bit version on your side. Did you test the md5sum of that iso ?
md5 checksums match.
Have you set the memory limit of your virtual machine to 1GB or below?
If so please try with 2GB.
Yes, that’s it. I used 1gb. Now with 1,5 all good. But Kubuntu 13.10 64-bit insalled without problems with 1gb.