I'm also affected by this on Ubuntu/precise (Mint/maya). I have my internal laptop drive with dual boot HFS+/Mac OS X and ext4/GNU/Linux. The grub-mount hang never happens with that disk. It does happen when my external backup disk is attached. I thought maybe it had something to do with how the disks were partitioned. Here's my internal disk that works fine:
$ sudo parted /dev/sda GNU Parted 2.3 Using /dev/sda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) print Model: ATA ST9750420AS (scsi) Disk /dev/sda: 750GB Sector size (logical/physical): 512B/4096B Partition Table: gpt Number Start End Size File system Name Flags 1 20.5kB 210MB 210MB fat32 EFI System Partition boot 2 210MB 483GB 483GB hfs+ Untitled 3 484GB 645GB 161GB ext4 Untitled 4 645GB 666GB 21.5GB ext3 Apple_HFSX_Untitled_4 5 666GB 750GB 83.8GB ext3 Apple_HFSX_Untitled_2 Here's the backup disk that triggers the problem: $ sudo parted /dev/sdb GNU Parted 2.3 Using /dev/sdb Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) print Model: WD Ext HDD 1021 (scsi) Disk /dev/sdb: 2000GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 20.5kB 210MB 210MB fat32 EFI System Partition boot 2 210MB 400GB 400GB hfsx BIGBACKUP 3 400GB 2000GB 1600GB ext4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/988583 Title: grub-mount hangs when update-grub is ran To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/988583/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs