sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  linux-image-extra-3.13.0-54-generic linux-image-extra-3.13.0-55-generic
The following packages will be upgraded:
  php5-common php5-curl php5-fpm php5-pgsql
4 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
2 not fully installed or removed.
Need to get 0 B/2714 kB of archives.
After this operation, 304 MB disk space will be freed.
Do you want to continue? [Y/n] y
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
	LANGUAGE = (unset),
	LC_ALL = (unset),
	LC_MONETARY = "lv_LV.UTF-8",
	LC_ADDRESS = "lv_LV.UTF-8",
	LC_TELEPHONE = "lv_LV.UTF-8",
	LC_NAME = "lv_LV.UTF-8",
	LC_MEASUREMENT = "lv_LV.UTF-8",
	LC_IDENTIFICATION = "lv_LV.UTF-8",
	LC_NUMERIC = "lv_LV.UTF-8",
	LC_PAPER = "lv_LV.UTF-8",
	LANG = "en_US.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
locale: Cannot set LC_ALL to default locale: No such file or directory
(Reading database ... 38560 files and directories currently installed.)
Removing linux-image-extra-3.13.0-54-generic (3.13.0-54.91) ...
depmod: FATAL: could not load /boot/System.map-3.13.0-54-generic: No such file or directory
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-54-generic /boot/vmlinuz-3.13.0-54-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-54-generic /boot/vmlinuz-3.13.0-54-generic
update-initramfs: Generating /boot/initrd.img-3.13.0-54-generic
grep: /boot/config-3.13.0-54-generic: No such file or directory
WARNING: missing /lib/modules/3.13.0-54-generic
Device driver support needs thus be built-in linux image!
depmod: ERROR: could not open directory /lib/modules/3.13.0-54-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
mktemp: failed to create file via template '/var/tmp/mkinitramfs-FW_XXXXXX': No such file or directory
update-initramfs: failed for /boot/initrd.img-3.13.0-54-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
dpkg: error processing package linux-image-extra-3.13.0-54-generic (--remove):
 subprocess installed post-removal script returned error exit status 1
Removing linux-image-extra-3.13.0-55-generic (3.13.0-55.94) ...
depmod: FATAL: could not load /boot/System.map-3.13.0-55-generic: No such file or directory
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.13.0-55-generic /boot/vmlinuz-3.13.0-55-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.13.0-55-generic /boot/vmlinuz-3.13.0-55-generic
update-initramfs: Generating /boot/initrd.img-3.13.0-55-generic
grep: /boot/config-3.13.0-55-generic: No such file or directory
WARNING: missing /lib/modules/3.13.0-55-generic
Device driver support needs thus be built-in linux image!
depmod: ERROR: could not open directory /lib/modules/3.13.0-55-generic: No such file or directory
depmod: FATAL: could not search modules: No such file or directory
mktemp: failed to create file via template '/var/tmp/mkinitramfs-FW_XXXXXX': No such file or directory
update-initramfs: failed for /boot/initrd.img-3.13.0-55-generic with 1.
run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 1
dpkg: error processing package linux-image-extra-3.13.0-55-generic (--remove):
 subprocess installed post-removal script returned error exit status 1
Errors were encountered while processing:
 linux-image-extra-3.13.0-54-generic
 linux-image-extra-3.13.0-55-generic
E: Sub-process /usr/bin/dpkg returned an error code (1)