I have an ubuntu 10.04 server with text mode and find out the following output:
cat /var/log/syslog | grep device-mapper
Apr  7 11:57:58 server01 kernel: [   30.590688] device-mapper: table: 251:2: 
crypt: Device lookup failed
Apr  7 11:57:58 server01 kernel: [   30.590869] device-mapper: ioctl: error 
adding target to table
Apr  7 11:57:58 server01 kernel: [   30.599411] device-mapper: ioctl: asked to 
rename a non existent device cryptswap1_unformatted -> cryptswap1

I have read all posts in these bug report
https://bugs.launchpad.net/ubuntu/+source/mountall/+bug/527666/comments/112

and then directed to this bug report
https://bugs.launchpad.net/bugs/561390

I have found out by chance this morning the above massages disappeared totally 
after I plus "#" in front of the line "cryptswap1 /dev/md2 /dev/urandom swap, 
cipher=aes-cbc-essiv:sha256."
This line was written in the configuring file /etc/crypttab which I have been 
reported it as a bug solution in 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/206129/comments/51

Now the booting process is OK and the swap mounted in /etc/fstab on
Raid1 by uuid work well.

Thank all of you !

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https://bugs.launchpad.net/bugs/561390

Title:
  LVM - /var failed to mount during boot

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