[ubuntu] win 7 + Ubuntu => error: invalid EFI file path

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http://ubuntuforums.org – I had an Asus R401VB with working Windows 7 installed and working fine on 300GB (2 partitions) of a 1TB HDD - the rest was unallocated. I attempted to install ubuntu 12.04 LTS from USB pen drive: installer did not detect the windows OS so backed out of install. Running from the live USB stick I could see the windows partitions with disk utility but not gparted. I researched a bit and ended up at http://www.rodsbooks.com/missing-parts/ . So I ran gdisk and let it do its stuff, exiting with w to write out the GPT. Now the installer of ubuntu spotted the windows OS and I selected the dual-boot (Hardware)