Updates keep holding stuff back...

[pepsifx357]

I was wanting to get pithos on my Ubuntu, which by the way has some serious problems. If it wasn't for the fact that 12.04 is so redicoulously fast, the Xorg restarts during video playback would seriously annoy me. Anyway, I'm using the PPA for pithos, however it's holding that and a kernel back. Pithos is broken right now and I really need that update.

The following packages have been kept back:
  linux-generic-pae linux-headers-generic-pae linux-image-generic-pae pithos
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.

Any reason for this?

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Edit: I ran the Update Manager, rather than the command line apt-get upgrade and It seems to be downloading and installing now. Is this a bug?