I recently installed 12.04.2 and am running the 3.5.0-23 kernel.  I ran
into the exact same problems mentioned above with the blktap module so I
tested the precise-proposed package.  After upgrading the package I was
able to load the blktap module without problems.  When starting a HVM
virtual machine with xe start there is however a problem booting from a
cdrom iso.  The quemu bootload claims gives the error

CDROM boot error code 0003
Boot from CD-rom failed: could not read the boot disk

Syslog has errors regarding blktap:

[75925.627105] blktap_device_make_request: 732 callbacks suppressed
[75925.627114] block tdb: make request: -22, failing
[75925.627123] end_request: I/O error, dev tdb, sector 0
[75925.629387] Buffer I/O error on device tdb, logical block 0
[75925.654192] block tda: make request: -22, failing
[75925.654205] end_request: I/O error, dev tda, sector 64
[75925.656909] Buffer I/O error on device tda, logical block 16
[75925.658163] Buffer I/O error on device tda, logical block 17
[75925.662738] block tda: make request: -22, failing
[75925.662746] end_request: I/O error, dev tda, sector 64
[75925.665825] Buffer I/O error on device tda, logical block 16
[75925.666700] Buffer I/O error on device tda, logical block 17
[75925.672574] block tda: make request: -22, failing
[75925.672582] end_request: I/O error, dev tda, sector 64
[75925.676078] Buffer I/O error on device tda, logical block 16

I'm guessing this is related to the blktab-dkms package

Anyone else seeing similar issues using blktap-dkms/precise-proposed ?

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https://bugs.launchpad.net/bugs/1157421

Title:
  blktap-dkms version in 12.04.2 is not compatible with the 12.04.2
  kernel

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