I think why this is only happening for some people is that update- initramfs doesn't end up being a symlink for them. casper.postinst contains the following:
#! /bin/sh # If running from writable media, make sure that update-initramfs is # properly a symlink. if [ "$1" = configure ] && dpkg --compare-versions "$2" lt-nl 1.253 && \ [ -w /cdrom ] && [ -e /usr/sbin/update-initramfs.distrib ] && \ [ ! -L /usr/sbin/update-initramfs ] && \ fgrep -qs update-initramfs.distrib /usr/sbin/update-initramfs; then ln -nsf /usr/share/casper/casper-update-initramfs \ /usr/sbin/update-initramfs fi update-initramfs -u #DEBHELPER# If you just install casper and don't pass all the tests update-initramfs won't be symlinked to casper-update-initramfs and then you will be able to install kernel updates. However, if the symlink is created you'll likely have problems using update-initramfs. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/984276 Title: installing casper on a non live system causes update-initramfs to fail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/casper/+bug/984276/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs