Comment 3 for bug 204187

I did some testing on this issue with Lubuntu 14.04. As I don't have a eeePC (or simmilar) with 4 Gigs hard disk, I used Virtualbox. On a real machine, it's possible to cheat Ubiquity about the avaible space with a pendrive, as that isn't working in Virtualbox, I made a virtual disk with 4,75 GB space. I gave the VM one of my four cores (mobile Intel i5, third generation) and only 512 MB RAM, to simulate the first eeePCs as good as possible. My steps:

* normal boot to the desktop with 14.04 live iso
* install btrfs-tools
* created 3 partitions with GParted: 128 MB /boot (ext2), 128 MB /swap and the rest was for the btrfs root partition
* I applied the workaround in [1] (see above) and did the installation more or less normally
* before the reboot, I edited the /etc/fstab of the new installation to reflect the compression
* finally: only reboot, no virtualbox-guest-dkms, no updates, nothing

The installation only uses ~1 GB disk space (df -h showed 980M). 3,3 GB shown as free. Subtract the additional 0,75 GB I needed to let Ubiquity work, the fictional eeePC would have at least 2,5 GB free disk space. I think this is really awesome! The VM is quite responsive, too. Firefox opens in 2-3 seconds.