Comment 5 for bug 501757

I had a similar issue when installation was at about 90% complete:

Executing 'grub-install (hd0)' failed.

This is a fatal error.

We're sorry; the installer crashed. Please file a new bug report at https://launchpad.net/ubuntu/+source/ubiquity/+filebug (do not attach your details to any existing bug) and a developer will attend to the problem as soon as possible. To help the developers understand what went wrong, include the following detail in your bug report, and attach the files /var/log/syslog and /var/log/partman:

Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 457, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 442, in main
    install(args[0], query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 245, in install
    ret = wizard.run()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 465, in run
    self.progress_loop()
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 975, in progress_loop
    (ret, realtb))
RuntimeError: Install failed with exit code 1
Traceback (most recent call last):
  File "/usr/share/ubiquity/install.py", line 2453, in <module>
    install.run()
  File "/usr/share/ubiquity/install.py", line 459, in run
    self.configure_bootloader()
  File "/usr/share/ubiquity/install.py", line 1810, in configure_bootloader
    "GrubInstaller failed with code %d" % ret)
InstallStepError: GrubInstaller failed with code 1