[Bug 874774] Re: could not mount /dev/mapper/cryptswap1

[Robbert Korving]

I just installed http://archive.ubuntu.com/ubuntu/dists/precise-
updates/main/installer-i386/current//images/netboot/boot.img.gz

and chose home encryption during the command-line installation. I get
the same message "could not mount /dev/mapper/cryptswap1 M for manual S
for skip" during boot. The only thing I did is "sudo tasksel install
lubuntu-desktop".

Now I read here that it's fixed, but I can't see the solution between all the code.
Can somebody sum up the steps to manually fix this problem?

I'm familiar with sudo and vim and I'm looking for something like.
1. Use "sudo command --options"
2. Open "/etc/file-that-should-be-changed" and change "remove-bug=false" to "remove-bug=true"

It would help me and also the next person who googles this problem.
Thank you!

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https://bugs.launchpad.net/bugs/874774

Title:
  could not mount /dev/mapper/cryptswap1

Status in “cryptsetup” package in Ubuntu:
  Fix Released
Status in “cryptsetup” source package in Oneiric:
  Triaged
Status in “cryptsetup” source package in Precise:
  Fix Released

Bug description:
  On multiple fresh installs since beta release 2 i have been experiencing this issue:
  during boot up, i receive the message "could not mount /dev/mapper/cryptswap1 M for manual S for skip"
  obviously I'm expecting no message to show up at all and it should boot perfectly fine. I do however believe that i have found where the problem lies, it is in /etc/fstab
  This is how the original file looked:

  # /etc/fstab: static file system information.
  #
  # Use 'blkid' to print the universally unique identifier for a
  # device; this may be used with UUID= as a more robust way to name devices
  # that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  proc            /proc           proc    nodev,noexec,nosuid 0       0
  # / was on /dev/sda7 during installation
  UUID=482c5b33-9ce8-4575-b787-cddeb1e93a5e /               ext4    errors=remount-ro 0       1
  # swap was on /dev/sda8 during installation
  #UUID=eb23dadc-8e08-4769-8fc5-0b1216b67e5b none            swap    sw              0       0
  /dev/mapper/cryptswap1 none swap sw 0 0

  
  i believe the problem is that the following line of:
  #UUID=eb23dadc-8e08-4769-8fc5-0b1216b67e5b none            swap    sw              0       0

  is not supposed to be commented out, i believe this happens somewhere
  in install. The ghetto fix for this is simply to remove the comment on
  it, but it definitely should not be happening...

  i have also found a eerily similar problem from Ubuntu 9.10 Bug
  #490760  which is a "duplicate" of another bug that is why i
  classified this as cryptsetup, because that bug was.

  Here is more information:

  Description:	Ubuntu 11.10
  Release:	11.10

  cryptsetup:
    Installed: 2:1.1.3-4ubuntu2
    Candidate: 2:1.1.3-4ubuntu2
    Version table:
   *** 2:1.1.3-4ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

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