terry@Mercury:~$ sudo apt-get install virtualbox
[sudo] password for terry:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
abiword-common ghc ghc-doc i3lock i3status libabiword-3.0 libbsd-dev
libdbd-mysql-perl libdbi-perl libffi-dev libghc-data-default-class-dev
libghc-data-default-dev libghc-data-default-instances-base-dev
libghc-data-default-instances-containers-dev
libghc-data-default-instances-dlist-dev
libghc-data-default-instances-old-locale-dev libghc-dlist-dev
libghc-extensible-exceptions-dev libghc-mtl-dev libghc-mtl-doc
libghc-old-locale-dev libghc-old-time-dev libghc-random-dev
libghc-setlocale-dev libghc-utf8-string-dev libghc-x11-dev libghc-x11-doc
libghc-x11-xft-dev libghc-x11-xft-doc libghc-xmonad-contrib-dev
libghc-xmonad-contrib-doc libghc-xmonad-dev libghc-xmonad-doc libjpeg62
liblink-grammar5 libloudmouth1-0 libncurses5-dev libots0 libtelepathy-glib0
libterm-readkey-perl libtinfo-dev libwv-1.2-4 libxt-dev
link-grammar-dictionaries-en mariadb-common minisat python-gconf
suckless-tools
Use 'sudo apt autoremove' to remove them.
The following additional packages will be installed:
virtualbox-qt
Suggested packages:
vde2 virtualbox-guest-additions-iso
The following NEW packages will be installed:
virtualbox virtualbox-qt
0 upgraded, 2 newly installed, 0 to remove and 349 not upgraded.
2 not fully installed or removed.
Need to get 23.4 MB of archives.
After this operation, 99.7 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://us.archive.ubuntu.com/ubuntu yakkety/multiverse amd64 virtualbox amd64 5.1.6-dfsg-2
404 Not Found [IP: 91.189.91.23 80]
Err:2 http://us.archive.ubuntu.com/ubuntu yakkety/multiverse amd64 virtualbox-qt amd64 5.1.6-dfsg-2
404 Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/...sg-2_amd64.deb 404 Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/...sg-2_amd64.deb 404 Not Found [IP: 91.189.91.23 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
terry@Mercury:~$

apt-get is not able to find the requested packages.

So, first run and see if any errors are returned. If so, you current repository is not correct.

I am not an Ubuntu user, so I cannot point you to the correct repository, but Google might help you. "Ubuntu repository <your version name>" (Without quotes)

If apt-get update returns fine, search for the package you try to install. It should find something which you then can install.

jlinkels

Ubuntu 16.10 is not a long-term release and went end of life in 2017.

You should upgrade to 17.10 or fresh install 16.04 (the latest long-term release).

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