Menu System Tools/Software Updater not working after Lubuntu upgrade from 16.04 to 18.04

[grasso]

Dear mailing list members,

Hopefully I can get support for below issue.

I recently upgraded from Lubuntu 16.04 to 18.04 and did not find any 
issues on applications I previously used.
Unfortunately now Software Updater is not working.

Menu System Tools/Software Updater shows update information but does not 
update:
After clicking on Install Now the Updater screen will be shown only for 
a few seconds.

I used LXTerminal to be able to show error message shown below.
Update error after trying to update using /usr/bin/update-manager

cp-admin at cpadmin-PX707AA-ABH-SR1409NL-NL520:/usr/bin$ cd /usr/bin
cp-admin at cpadmin-PX707AA-ABH-SR1409NL-NL520:/usr/bin$ update-manager

(update-manager:4944): GLib-GIO-CRITICAL **: 11:46:57.955: 
g_dbus_proxy_new: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
cp-admin at cpadmin-PX707AA-ABH-SR1409NL-NL520:/usr/bin$

_Extra information about upgrade:__
_During the upgrade I got a question about "Configuring 
unattanded-upgrades" the following Help information was shown:
 >>>
A new version (/etc/apt/apt.conf.d/50unattended-ipgrades.ucftmp) of 
configuration file "/etc/apt/apt.conf.d/50unattended-ipgrades is 
available, but the version installed currently has been locally modified.
<<<
I responded with "install the package maintainer's version" i.s.o. "keep 
the local version currently installed"

Checked currently available versions of files starting with 50:
ls -l /etc/apt/apt.conf.d/50*
-rw-r--r-- 1 root root  625 mrt 16 12:23 
/etc/apt/apt.conf.d/50command-not-found
-rw-r--r-- 1 root root 3728 jul 18 13:22 
/etc/apt/apt.conf.d/50unattended-upgrades
-rw-r--r-- 1 root root 2656 mei 20  2017 
/etc/apt/apt.conf.d/50unattended-upgrades.ucf-dist
-rw-r--r-- 1 root root 2331 apr  2  2014 
/etc/apt/apt.conf.d/50unattended-upgrades.ucf-old

-- 

Kind regards,

Frans Grasso
The Netherlands
E-mail: grasso at deds.nl

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