removal of linux-image-extra-3.19.0-15-generic fails

[Karl-Philipp Richter]

removal of linux-image-extra-3.19.0-15-generic fails due to

    Removing linux-image-extra-3.19.0-15-generic (3.19.0-15.15) ...
    depmod: FATAL: could not load /boot/System.map-3.19.0-15-generic: No such file or directory
    run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 3.19.0-15-generic /boot/vmlinuz-3.19.0-15-generic
    run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.19.0-15-generic /boot/vmlinuz-3.19.0-15-generic
    update-initramfs: Generating /boot/initrd.img-3.19.0-15-generic
    WARNING: missing /lib/modules/3.19.0-15-generic
    Ensure all necessary drivers are built into the linux image!
    depmod: ERROR: could not open directory /lib/modules/3.19.0-15-generic: No such file or directory
    depmod: FATAL: could not search modules: No such file or directory
    sed: can't read /usr/share/plymouth/themes/ubuntu-text/ubuntu-text.plymouth: No such file or directory
    E: /usr/share/initramfs-tools/hooks/plymouth failed with return 2.
    update-initramfs: failed for /boot/initrd.img-3.19.0-15-generic with 2.
    run-parts: /etc/kernel/postinst.d/initramfs-tools exited with return code 2
    dpkg: error processing package linux-image-extra-3.19.0-15-generic (--remove):
     subprocess installed post-removal script returned error exit status 1
    Errors were encountered while processing:
     linux-image-extra-3.19.0-15-generic
    E: Sub-process /usr/bin/dpkg returned an error code (1)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-30.36-generic 4.2.8-ckt3
Uname: Linux 4.2.0-30-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Mon Feb 29 00:42:15 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-02-27 (1 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to xenial on 2016-02-28 (0 days ago)