If you have fault „file is to large” you can use following command: buffer -i /mnt/disk/image.img -o /home/user/image.img -m 5000000 the -m value is buffer size. I’ve got this problem
To save Umbrello save problem with xmi files on Ubuntu 16.06 download other version and install wget http://ftp.br.debian.org/debian/pool/main/u/umbrello/umbrello_4.14.2-1_amd64.deb dpkg -i ./umbrello_4.14.2-1_amd64.deb