eu corri o comando
sudo apt-get install & sudo apt-get dist-upgrade -d
dá a seguinte saída
nitesh@nitesh:~$ sudo apt-get upgrade
[sudo] password for nitesh:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
checkbox-qt chromium-browser chromium-browser-l10n dconf-editor easystroke
firmware-b43-installer gambas3 gambas3-gb-opengl gambas3-gb-opengl-glsl
gambas3-gb-opengl-glu gambas3-gb-pdf gambas3-gb-sdl gambas3-gb-sdl-sound
gnome-commander gnome-icon-theme-full gnome-online-accounts gnome-panel
gnome-panel-data gnome-session-flashback gstreamer0.10-plugins-ugly
gstreamer1.0-libav gstreamer1.0-plugins-ugly gtk2-engines-pixbuf katepart
kde-runtime kdelibs5-plugins kget libaacs0 libcairo-perl libchromaprint0
libclutter-gst-1.0-0 libcodeblocks0 libdate-calc-xs-perl
libffmpegthumbnailer4 libfftw3-3 libgcr-3-1 libglib-perl libgtk2-perl
libkactivities-bin libkactivities-models1 libkactivities6
libkatepartinterfaces4 libkonq-common libkonq5abi1 libktorrent5
libkxmlrpcclient4 libnepomukcleaner4 libnepomukcore4abi1 libnepomukwidgets4
libnspr4-0d libpango-perl libqapt2 libschroedinger-1.0-0 libsdl-image1.2
libspandsp2 libssh2-1 libwxgtk2.8-0 linux-generic linux-headers-generic
linux-headers-generic-pae linux-image-generic nepomuk-core-runtime
ntrack-module-libnl-0 plasma-scriptengine-javascript python-imaging-compat
python-pyexiv2 python3-pyatspi2 python3-software-properties python3-virtkey
software-properties-common software-properties-gtk synaptic unity
unity-services xserver-xephyr
0 upgraded, 0 newly installed, 0 to remove and 75 not upgraded.
nitesh@nitesh:~$
agora o que devo fazer por favor me ajude.
Executar,
$ sudo apt-get update && sudo apt-get dist-upgrade
Clique no menu iniciar e digite "update-manager -d" e selecione - > atualizar mannager -d - > Verifique se há atualizações e você receberá
Clique em OK para atualizar, após a atualização finalizada, o sistema de reinicialização.
sudo do-release-upgrade é realmente o comando recomendado para fazer isso! Experimente.