They are two different errors:
Code:
ACPI: Expecting a [Reference] package element, found type 0.
Take a look at
this post for some information. This is from the original poster and unfortunately no solution has been posted, but it give some information about a known bug. You can try also to search this exact error message enclosed in double quotes in Google. You will get a lot of hits and maybe you can find something useful among the lines.
Code:
end_request: I/O error, dev sr0, sector 1409920
buffer I/O error on device sr0, logical block 352480
This is a bad sector in your burned DVD (/dev/sr0 is the dvd drive). Maybe you have just to burn a new one, carefully checking the integrity of the surface before burning it.