The idea is that apt-get upgrade only upgrades individual packages, whereas apt-get dist-upgrade upgrades the whole distribution. There is another command apt-get dist-upgrade which is willing to remove packages if necessary. But apt-get upgrade doesn't take any risk. Apt also has a concept of automatically-installed vs manually-installed package it should be ok to remove an automatically-installed package even if it isn't explicitly getting replaced, whereas manually-installed packages are requested by the user and should stay. In addition to basic dependencies (A requires B), a package C can declare that it “replaces” a package B, indicating that when C is installed, it should be ok to uninstall B. Over time, packages get broken into pieces, joined together, renamed, etc. If upgrading package A requires uninstalling package B, apt-get upgrade won't do it, and A ends up in the “not upgraded” list. Xserver-xorg-video-vmware-lts-vivid yelp zeitgeist-core zenity zenity-commonĠ upgraded, 0 newly installed, 0 to remove and 961 not upgraded.Īpt-get upgrade plays it safe: it upgrades all the packages that can be upgraded without breaking other packages. Xserver-xorg-video-trident-lts-vivid xserver-xorg-video-vesa-lts-vivid Xserver-xorg-video-sisusb-lts-vivid xserver-xorg-video-tdfx-lts-vivid Xserver-xorg-video-siliconmotion-lts-vivid Xserver-xorg-video-radeon-lts-vivid xserver-xorg-video-savage-lts-vivid Xserver-xorg-video-openchrome-lts-vivid xserver-xorg-video-r128-lts-vivid Xserver-xorg-video-neomagic-lts-vivid xserver-xorg-video-nouveau-lts-vivid Xserver-xorg-video-mach64-lts-vivid xserver-xorg-video-mga-lts-vivid Xserver-xorg-video-fbdev-lts-vivid xserver-xorg-video-intel-lts-vivid Xserver-xorg-video-ati-lts-vivid xserver-xorg-video-cirrus-lts-vivid Xserver-xorg-lts-vivid xserver-xorg-video-all-lts-vivid Xserver-xorg-input-vmmouse-lts-vivid xserver-xorg-input-wacom-lts-vivid Notice the last line, how do I forcefully update those 961 items?. When I tried to upgrade from Ubuntu 14.04 to 16.04, this is the message logs shown after sudo apt-get upgrade.
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