Confirmed with ubiquity 2.6.10, this is not a problem with Ubiquity but with partman and it is reproducible with the debian-installer.
Actually, the partition is correctly resized to the size indicated by the slider but it creates 2 partitions in this space, a root partition and a swap partition. So in the case where you resize to 2.7GB, the allocated space to the root partition is 2.7 - swapsize (e.g 1GB) leaving only 1.7GB for the root partition.
It's the same problem with the text installer, if the user selects 'resize' and resizes the partition to the maximum value proposed, then the partition is correctly resized but it also creates a swap partition in the free space. The installer doesn't stop immediately after the partitioning but further in the installation process when files are being installed and stops with a 'No space left on device'
On a side note, when a system is installed more than on time and the user chooses to overwrite the Ubuntu partition (e.g Windows installed alongside with Ubuntu, and reinstalling Ubuntu) a new swap partition is created each time ending up with as many swap partition as times the system has been reinstalled.
Confirmed with ubiquity 2.6.10, this is not a problem with Ubiquity but with partman and it is reproducible with the debian-installer.
Actually, the partition is correctly resized to the size indicated by the slider but it creates 2 partitions in this space, a root partition and a swap partition. So in the case where you resize to 2.7GB, the allocated space to the root partition is 2.7 - swapsize (e.g 1GB) leaving only 1.7GB for the root partition.
It's the same problem with the text installer, if the user selects 'resize' and resizes the partition to the maximum value proposed, then the partition is correctly resized but it also creates a swap partition in the free space. The installer doesn't stop immediately after the partitioning but further in the installation process when files are being installed and stops with a 'No space left on device'
On a side note, when a system is installed more than on time and the user chooses to overwrite the Ubuntu partition (e.g Windows installed alongside with Ubuntu, and reinstalling Ubuntu) a new swap partition is created each time ending up with as many swap partition as times the system has been reinstalled.
I'm moving to partman-auto