Ubuntu

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Search for packages.

http://www.ltsp.org/twiki/bin/view/Ltsp/WebHome

Which package contains file

$ apt-file search filename

List contents of package

$ apt-file list packagename

Update apt-file database.

# apt-file update


Prepare ltsp environment.

sudo cp /etc/apt/sources.list /opt/ltsp/i386/etc/apt/sources.list
sudo chroot /opt/ltsp/i386
apt-get update

Installed packages.

dpkg --get-selections
apt-get install openssh-client openssh-server

List packages on one machine and install on another.

dpkg --get-selections > installed-software
dpkg --set-selections < installed-software
dselect

Upgrade.

sudo apt-get -y update
sudo apt-get -y upgrade

Which package provides.

http://packages.ubuntu.com/

List available linux packages.

apt-cache pkgnames

install local deb packages

sudo dpkg -i 1.deb 2.deb