I: Installing apt-lines
I: user script /var/cache/pbuilder/base-test.cow/tmp/hooks/G50-initscripts-2.86.ds1-11-cdebootstrap0.3.9.sh starting
warning: can't open /etc/mtab: No such file or directory
umount: /sys: not mounted
warning: can't open /etc/mtab: No such file or directory
umount: /proc/bus/usb: not found
warning: can't open /etc/mtab: No such file or directory
umount: /dev/shm: not mounted
warning: can't open /etc/mtab: No such file or directory
umount: /proc: not mounted
warning: can't open /etc/mtab: No such file or directory
umount: /dev/pts: not mounted
I: user script /var/cache/pbuilder/base-test.cow/tmp/hooks/G50-initscripts-2.86.ds1-11-cdebootstrap0.3.9.sh finished

I: Refreshing the base.tgz <------------- ?????