ENH: update isntallation procedure for Ubuntu (with otb-ubuntugis ppa)
ENH: update isntallation procedure for Ubuntu (with otb-ubuntugis ppa)

orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB,orfeotoolbox/OTB