I think the 12288-byte file has been truncated at some point.
dpkg-deb (subprocess): cannot copy archive member from 'ubuntu/pool/main/qemu_1.2.0+noroms-0ubuntu7.12.10_amd64.deb' to decompressor pipe: unexpected end of file or stream
Then, tar chokes on unexpected EOF.
I think the 12288-byte file has been truncated at some point.
dpkg-deb (subprocess): cannot copy archive member from 'ubuntu/ pool/main/ qemu_1. 2.0+noroms- 0ubuntu7. 12.10_amd64. deb' to decompressor pipe: unexpected end of file or stream
Then, tar chokes on unexpected EOF.