Hi Mathieu
i manage hard disk with Gparrted and Ubuntu was intended to be installed
on one of the primary partition ( flaged as root ) Another primary was
used for windows, third was flaged as home, and 4th was swap
BUT
i don't know anymore, if problem was with ubuntu but instead in partition
Public bug reported:
Install is on new Aces Aspire
ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: ubiquity 2.21.25
ProcVersionSignature: Ubuntu 3.19.0-15.15-lowlatency 3.19.3
Uname: Linux 3.19.0-15-lowlatency x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CasperVersion: 1.360