How to mount a HFS partition in Ubuntu as Read/Write?

You can enable writing to HFS+ in Linux even if you didn't disable journaling. In addition to hfsplus which you already have, you need to have hfsprogs installed:

sudo apt-get install hfsprogs

Then, use the -o force option:

sudo mount -o force /dev/sdX /your/mount/point

If the drive has been mounted automatically (as it should be on a desktop system like Ubuntu), you can enable write with

sudo mount -o remount,rw,force /mount/point

or

sudo mount -o remount,rw,force /dev/sdx

/mount/point would usually be /media/Your_drive_label /dev/sdx is your HFS+ device

Use mount -l to find which device is already mounted on which mount point.