root cause found! workaround found! It is a permission problem when you have installed from "alternate-CD"!
Checking /usr/share/doc/update-notifier/README gave me the deciding hint: "gksu is required". It is installed of course, but: With alternate-CD you normally get a true root-account, which is one of the reasons why I have choosen that way (besides installing legacy-grub, a fixed network interface with fixed IP, ...). "true root-account" does not include permissions for group "admin". This is /etc/sudoers as from installation: ------------------------ Defaults env_reset # Host alias specification # User alias specification # Cmnd alias specification # User privilege specification root ALL=(ALL) ALL # Allow members of group sudo to execute any command after they have # provided their password # (Note that later entries override this, so you might need to move # it further down) %sudo ALL=(ALL) ALL # #includedir /etc/sudoers.d ----------------------------- I now added permission for group "admin" and modified "Defaults: --------------------- ... #Defaults env_reset Defaults !lecture,tty_tickets,!fqdn,targetpw,timestamp_timeout = 0 .... # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL ----------------------- and, to ask for root-password instead of the "admin-user" password for permission requests under GNOME I had to cheat polkit-1 by overriding the Ubuntu modifications in 51-ubuntu-admin.conf: cp /etc/polkit-1/localauthority.conf.d/ 50-localauthority.conf /etc/polkit-1/localauthority.conf.d/52-ask-rootpw.conf With theese modifications all works fine as expected. At the end I do not know whom to blame for this nasty bug: Ubuntu-installer on alternate-CD, polkit-1 configuration, update-manager for not accepting user to be in group "sudo", ... Nevertheless it is a severe security issue for those who install fronm alternate-CD -- update-manager doesn't show updates, even after 1 week https://bugs.launchpad.net/bugs/356152 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
