All my Jessie machines started reporting this error this morning. (unattended-upgrades is run daily on all these machines.)
I am enclosing log files from today and 2 days preceeding on a representative machine -- Marty
(Reading database ... 123230 files and directories currently installed.) Preparing to replace libapt-pkg4.12:i386 0.9.11.4 (using .../libapt-pkg4.12_0.9.12.1_i386.deb) ... Unpacking replacement libapt-pkg4.12:i386 ... Setting up libapt-pkg4.12:i386 (0.9.12.1) ... Processing triggers for libc-bin ... (Reading database ... 123230 files and directories currently installed.) Preparing to replace apt 0.9.11.4 (using .../archives/apt_0.9.12.1_i386.deb) ... Unpacking replacement apt ... Processing triggers for man-db ... Setting up apt (0.9.12.1) ... (Reading database ... 123230 files and directories currently installed.) Preparing to replace libapt-inst1.5:i386 0.9.11.4 (using .../libapt-inst1.5_0.9.12.1_i386.deb) ... Unpacking replacement libapt-inst1.5:i386 ... Preparing to replace libass4:i386 0.10.1-2 (using .../libass4_0.10.1-3_i386.deb) ... Unpacking replacement libass4:i386 ... Preparing to replace apt-utils 0.9.11.4 (using .../apt-utils_0.9.12.1_i386.deb) ... Unpacking replacement apt-utils ... Processing triggers for man-db ... Setting up libapt-inst1.5:i386 (0.9.12.1) ... Setting up libass4:i386 (0.10.1-3) ... Setting up apt-utils (0.9.12.1) ... Processing triggers for libc-bin ...
(Reading database ... 123230 files and directories currently installed.) Preparing to replace libfile-mimeinfo-perl 0.18-1 (using .../libfile-mimeinfo-perl_0.20-1_all.deb) ... Unpacking replacement libfile-mimeinfo-perl ... Processing triggers for man-db ... Setting up libfile-mimeinfo-perl (0.20-1) ...
(Reading database ... 123230 files and directories currently installed.) Preparing to replace libcloog-isl4:i386 0.18.0-2 (using .../libcloog-isl4_0.18.1-1_i386.deb) ... Unpacking replacement libcloog-isl4:i386 ... Preparing to replace libisl10:i386 0.11.2-1 (using .../libisl10_0.12.1-1_i386.deb) ... Unpacking replacement libisl10:i386 ... Preparing to replace dconf-service 0.16.1-1 (using .../dconf-service_0.18.0-1_i386.deb) ... Unpacking replacement dconf-service ... Preparing to replace libdconf1:i386 0.16.1-1 (using .../libdconf1_0.18.0-1_i386.deb) ... Unpacking replacement libdconf1:i386 ... Preparing to replace dconf-gsettings-backend:i386 0.16.1-1 (using .../dconf-gsettings-backend_0.18.0-1_i386.deb) ... Unpacking replacement dconf-gsettings-backend:i386 ... Preparing to replace libsoup2.4-1:i386 2.42.2-6 (using .../libsoup2.4-1_2.44.1-1_i386.deb) ... Unpacking replacement libsoup2.4-1:i386 ... Preparing to replace libspice-server1:i386 0.12.4-0nocelt1 (using .../libspice-server1_0.12.4-0nocelt1.1_i386.deb) ... Unpacking replacement libspice-server1:i386 ... Preparing to replace libupower-glib1:i386 0.9.22-1 (using .../libupower-glib1_0.9.23-2_i386.deb) ... Unpacking replacement libupower-glib1:i386 ... Preparing to replace upower 0.9.22-1 (using .../upower_0.9.23-2_i386.deb) ... Unpacking replacement upower ... Processing triggers for man-db ... Processing triggers for libglib2.0-0:i386 ... Setting up libisl10:i386 (0.12.1-1) ... Setting up libcloog-isl4:i386 (0.18.1-1) ... Setting up libdconf1:i386 (0.18.0-1) ... Setting up dconf-service (0.18.0-1) ... Setting up dconf-gsettings-backend:i386 (0.18.0-1) ... Setting up libsoup2.4-1:i386 (2.44.1-1) ... Setting up libspice-server1:i386 (0.12.4-0nocelt1.1) ... Setting up libupower-glib1:i386 (0.9.23-2) ... Setting up upower (0.9.23-2) ... Installing new version of config file /etc/UPower/UPower.conf ... Processing triggers for libc-bin ...