Upgrade from Ubuntu 10.04lts to 12.04lts

Howdy -- it shouldn't be a problem to upgrade to a new Ubuntu version.

While we agree, you should definitely back everything up (as a lot of stuff changes during a distribution upgrade) -- it's possible to upgrade from Ubuntu 10.04 to 12.04.

There isn't anything in particular that you should have to adjust beforehand or afterwards.

If you run into any problems, let us know and we can assist you in troubleshooting.

Can you clarify whether you're having problems with your setup, outside of the log entries you're seeing?

That is, if not looking at the logs, are you seeing any additional symptoms?

Not that we can't still look into the log messages, we just wanted to understand the problems you're having exactly.

Thanks for the additional info.

You're definitely seeing some unusual issues there, I hadn't run into any of those when performing upgrades to Ubuntu 12.04. I don't think it's anything you did wrong, but there could be something different about your hardware or software setup that's triggering those.

One error I see is this one:

program smartctl is using a deprecated SCSI ioctl

Digging around a bit, it doesn't sound like that's anything but a noisy warning, and that's not a cause for concern. Apparently newer smartctl versions correct that.

You may have done this already, but I'd suggest verifying that you're using the latest packages for your distro. You can do that with this command:

apt-get update && apt-get upgrade

Another error I see a lot of in your logs is this one:

xhci_hcd 0000:06:00.0: WARN: Stalled endpoint

Doing some Googling on that, that sounds like a USB device of some kind. Do you have an external storage device or USB mouse plugged into this system? You could be seeing problems with either the device itself, or the kernel support for that device.

The kernels you're referring to... I suspect what you were seeing was the PAE mode kernel, which allows a 32 bit system to make use of RAM above the 3GB mark (usually, if you have a 32 bit system, you can make use of at most 3GB of RAM).

What do these two commands show:

That will show what kernel you have, whether the files on your system are 32 or 64 bit, and how much RAM you have.

Lastly, I see some errors related to your RAID system. What is the output of this command:

cat /proc/mdstat

Your RAID looks okay, and you definitely have a 64 bit system.

I would recommend continuing to boot a normal 64 bit kernel, and not a PAE mode kernel.

But none of that explains why you aren't seeing a login prompt at the console.

I don't see anything unusual in your dmesg log, which sometimes can explain a bootup problem.

Could you attach the file "/var/log/boot.log"?

That contains all the bootup messages, even those by daemons, it's possible something in there will make it more clear what problem you're running into.