Bug:
$ sudo apt-get dist-upgrade Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done ..... Setting up linux-image-4.2.0-34-generic (4.2.0-34.39) ... Running depmod. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.2.0-34-generic /boot/vmlinuz-4.2.0-34-generic run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.2.0-34-generic /boot/vmlinuz-4.2.0-34-generic update-initramfs: Generating /boot/initrd.img-4.2.0-34-generic Warning: /sbin/fsck.btrfs doesn't exist, can't install to initramfs, ignoring.
Solution:
$ sudo ln -s /bin/fsck.btrfs /sbin/ $ sudo update-initramfs -u update-initramfs: Generating /boot/initrd.img-4.2.0-34-generic
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