During installation of M6 on my Acer Aspire One with the default package selection, the installation hung twice. The first time I assumed something had overheated and just restarted it.

The second time I did some investigating and discovered that the following command was pinning the CPU:
/usr/lib/ooo3/program/unopkg.bin add --shared --force /usr/lib/ooo3

An strace revealed that it is spinning indefinitely in communication with unopkg.

It is looping with:
read(0, "", 4096) = 0
write(1, "\n\nYour input was not correct. Please enter \"yes\" or \"no\":\n", 58) = 58

The only way for the installation to continue was to drop to a console, kill the looping process, and ignore the failure.