The update-notifier package exists, but you can't install it without removing the pin on *systemd* and installing libpam-systemd and libsystemd0. (See the release notes for how to do that.) You can use Synaptic to do update/upgrade.
Menu, System, Synaptic Package Manager, Reload, Mark all upgrades, Apply.
Same thing on command line:
- Code:
apt-get update
apt-get -s dist-upgrade # (-s/--simulate, to check the list first.)
apt-get dist-upgrade
Note: I will move this thread to the Help section. The howto section is for tutorials and guides.