Yes, I did do apt update after changing sources.
Here is the output of apt -a show systemd. I issued the command without the -a initially but at the end of the output it said there were two additional records and suggested adding -a to the command. Have I got two systemd versions mixing things up perhaps?
~# apt -a show systemd
Package: systemd
Version: 215-17+deb8u13
Installed-Size: 12.2 MB
Depends: libacl1 (>= 2.2.51-8), libaudit1 (>= 1:2.2.1), libblkid1 (>= 2.19.1), libcap2 (>= 1:2.10), libcryptsetup4 (>= 2:1.4.3), libkmod2 (>= 5~), libpam0g (>= 0.99.7.1), libselinux1 (>= 2.1.9), libsystemd0 (= 215-17+deb8u13), util-linux (>= 2.19.1-2), mount (>= 2.21), initscripts (>= 2.88dsf-53.2), sysv-rc, udev (>= 208-8), acl, adduser, libcap2-bin
Suggests: systemd-ui
Conflicts: klogd
Breaks: lsb-base (<< 4.1+Debian4), lvm2 (<< 2.02.104-1), systemd-shim (<< 8-2)
Pre-Depends: libc6 (>= 2.17), libgcrypt20 (>= 1.6.1), liblzma5 (>= 5.1.1alpha+20120614), libselinux1 (>= 1.32)
Recommends: libpam-systemd, dbus
Section: admin
Priority: extra
Download-Size: 2,576 kB
Description: system and service manager
systemd is a replacement for sysvinit. It is dependency-based and
able to read the LSB init script headers in addition to parsing rcN.d
links as hints.
.
It also provides process supervision using cgroups and the ability to
not only depend on other init script being started, but also
availability of a given mount point or dbus service.
Installing the systemd package will not switch your init system unless you
boot with init=/bin/systemd or install systemd-sysv in addition.
Package: systemd
Version: 215-17+deb8u7
Installed-Size: 12.2 MB
Depends: libacl1 (>= 2.2.51-8), libaudit1 (>= 1:2.2.1), libblkid1 (>= 2.19.1), libcap2 (>= 1:2.10), libcryptsetup4 (>= 2:1.4.3), libkmod2 (>= 5~), libpam0g (>= 0.99.7.1), libselinux1 (>= 2.1.9), libsystemd0 (= 215-17+deb8u7), util-linux (>= 2.19.1-2), mount (>= 2.21), initscripts (>= 2.88dsf-53.2), sysv-rc, udev (>= 208-8), acl, adduser, libcap2-bin
Pre-Depends: libc6 (>= 2.17), libgcrypt20 (>= 1.6.1), liblzma5 (>= 5.1.1alpha+20120614), libselinux1 (>= 1.32)
Recommends: libpam-systemd, dbus
Suggests: systemd-ui
Conflicts: klogd
Breaks: lsb-base (<< 4.1+Debian4), lvm2 (<< 2.02.104-1), systemd-shim (<< 8-2)
Section: admin
Priority: important
Download-Size: 2,574 kB
Description: system and service manager
systemd is a replacement for sysvinit. It is dependency-based and
able to read the LSB init script headers in addition to parsing rcN.d
links as hints.
.
It also provides process supervision using cgroups and the ability to
not only depend on other init script being started, but also
availability of a given mount point or dbus service.
.
Installing the systemd package will not switch your init system unless you
boot with init=/bin/systemd or install systemd-sysv in addition.
root@rglynsvr:~# apt -s install systemd udev libpam-systemd
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libpam-systemd : Depends: systemd-shim (>= 8-2) but it is not going to be installed or
systemd-sysv but it is not going to be installed
systemd : Depends: libsystemd0 (= 215-17+deb8u13) but 215-17+deb8u12 is to be installed
udev : Depends: libudev1 (= 215-17+deb8u13) but 215-17+deb8u12 is to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
Richard.