I wanted to install Lubuntu 12.10 to a 4GB USB flash drive, but  the
12.10 installer refuses to work if the disk size is less than 4.4GB.
That's a problem because Lubuntu would actually install fine on a 4GB
USB drive, especially if the user chooses to not create a swap
partition. But the installer doesn't let the user get past the "I won't
install on a <4.4GB disk" stage.

It's perfectly feasible to install Lubuntu to a 4GB flash drive; there
would about 2GB free space after installation with no swap partition.

Some suggestions:
 - Reduce the minimum allowable disk size and make it a recommendation, not 
mandatory.
 - When working out whether the drive is large enough for Lubuntu to be 
installed, take into account the size of any swap partition. Perhaps show a 
warning dialog if the user proceeds with a small drive, but don't prevent 
installation completely.

Here are some space-used figures after I installed Lubuntu 12.10 to a
4.4GB VirtualBox VM:

Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/sda1        3766504 1911200   1663972  54% /

Device     Start        End   Blocks  Id  System
/dev/sda1     2048  7655423  3826688  83  Linux
/dev/sda2  7657470  9226239   784385   5  Extended
/dev/sda5  7657472  9226239   784384  82  Linux swap / Solaris

Note the swap size! With no swap partition there would be almost 2.5GB
of free space. There would therefore be over 2GB of free space after
installing to a 4GB USB stick/memory card, if the installer allowed it.
That's plenty for light usage.

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https://bugs.launchpad.net/bugs/775124

Title:
  Ubiquity should have a command line option to override the free space
  check

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