What I noticed last - starting the update-manager gui and available updates are shown (gathered otherwise, may be last run?).
Starting the update / upgrade directly with the button
-> update now
it proceed without any delay. So I forced this circumstance by inserting into the file
-> /etc/rc.local -> apt-get update
and could verify this by
-> starting the update-manager and using first the button
-> install now
What I noticed last - starting the update-manager gui and available updates are shown (gathered otherwise, may be last run?).
Starting the update / upgrade directly with the button
-> update now
it proceed without any delay. So I forced this circumstance by inserting into the file
-> /etc/rc.local -> apt-get update
and could verify this by
-> starting the update-manager and using first the button
-> install now