Hi Steve, this issue can be easily reproduced through either of the following 
scenario on Ubuntu 12.04.
Assuming Ubuntu 12.04 is located as /sda2, and I have two HDD connected as sda, 
sdb. sdb4 is formatted as ext4

1. Adding one entry in /etc/fstab which will try to mount a non-existing disk 
device node. Simulate as failure partition
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/sdc4           /test                  ext2       defaults           0      
         0

2. Intentionally corrupt a working partition through DD command to simulate a 
disk/partition error
    dd if=/dev/zero of=/dev/sdb4 bs=1M count=100
    Then add an entry to found the failure partition
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
/dev/sdb4           /disk1                  ext2        defaults           0    
           0

 In either case, we saw system got stuck during mount procedure without
any message indicating which partition or disk is having problem and
never reach the login prompt.

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https://bugs.launchpad.net/bugs/1096307

Title:
    Boot process hang because 'mountall' fails

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