Here's what I do to fix: in scripts/LAST ad 20-remove-unsafe-io #!/bin/bash error=0; trap 'error=$(($?>$error?$?:$error))' ERR # save maximum error code rm -f $target/etc/dpkg/dpkg.cfg.d/unsafe-io sed -i -e 's/barrier=0,\?//' -e 's/nobarrier,\?//' $target/etc/fstab exit $error