I've just confirmed that this problem still happens in the saucy daily build, and that disabling secure boot [1] is a viable workaround. I don't have any Windows installation media to test.
[1]: http://community.acer.com/t5/Notebooks-Netbooks/How-do-I-disable-secure-boot-on-an-Aspire-V5-171/td-p/44003
I've just confirmed that this problem still happens in the saucy daily build, and that disabling secure boot [1] is a viable workaround. I don't have any Windows installation media to test.
[1]: http:// community. acer.com/ t5/Notebooks- Netbooks/ How-do- I-disable- secure- boot-on- an-Aspire- V5-171/ td-p/44003