Kubuntu 64-bit doesn't install with custom partitioning

[Caio Fratelli]

I tried to install Kubuntu 64-bits on my computer but I have two HDDs and I wanted to install it on the logical partitions of my secondary HDD.
After choosing the appropriate partitioning settings, the installer refuses to continue the installation and displays an error (see the attached screenshots) "Error informing the kernel about modifications to partition /dev/sdb5 -- Device or resource busy. This means Linux won't know about any changes you made to /dev/sdb5 until you reboot -- so you shouldn't mount it or use it in any way before rebooting." and then you can Cancel or Ignore it, if I choose to ignore, another error pops up with the following message "The attempt to mount a file system with type swap in SCSI3 (0,1,0), partition #5 (sdb) at none failed. You may resume partitioning from the partitioning menu", then I can't continue the installation from this point.

PS: It's hard to explain the details in english because my natural language is portuguese, if I wasn't clear enough with my words please tell me.

[Caio Fratelli (caiot5)]

Second error, note the "Devices recently plugged in" including the Hard Drive I'm trying to install the system on.

[Caio Fratelli (caiot5)]

Partitioning Settings.
/boot <-> ext3
swap
/ <-> ext3

[Phillip Susi (psusi)]

This was fixed several years ago by unmounting the swap partition during the partitinoing step.