System Administration tips for Ubuntu
If you've enabled full disk encryption, you will need to enter a password to unlock the disk at reboot time. If you want to be able to unlock the disk remotely via ssh, here are the steps
Host unlock
Hostname 192.168.56.101
User root
IdentityFile /Users/ksa/.ssh/id_rsa_ubuntu_unlock
StrictHostKeyChecking no
You can look at the /etc/apt/sources.list file, and in the /etc/apt/sources.list.d/ directory, but here is a single command line which can list all the sources
If you have a group of 10 or fewer Ubuntu hosts you administer, you can install Landscape (on premises version) in a VM to manage those hosts for free.
In addition to Landscape (or an alternative) is Cockpit which you can use to centrally manage CentOS, RedHat, Fedora, and Ubuntu hosts:
Command | Path | Package Name | Purpose / Notes |
---|---|---|---|
apt update | update repository metadata | ||
apt upgrade | install all pending updates | ||
apt-cache policy | list repository sources | ||
/var/log/apt/ | log directory containing 'history.log' and 'term.log' log files | ||
dpkg-query --list | list all installed packages | ||
dpkg-query --listfiles <package-name> | list all files owned by <package-name> | ||
dpkg-query --search <filename-pattern> | find out which installed package owns a filename | ||
apt-file search <filename-pattern> | apt-file | find out which package would install <filename-pattern>. package does not need to be installed already | |
aptitude install <package-name> apt install <package-name> apt-get install <package-name> | aptitude | install <package-name{ tip: use tab completion for actions and package names | |
apt show <package-name> aptitude show <package-name> | show details about <package-name>, including repository | ||
debconf-show <package-name> | show configuration options and current values of <package-name> | ||
dpkg-reconfigure <package-name> | reconfigures packages after they have already been installed. | ||
aptitude changelog <package-name> | displays the changelog for <package-name> | ||
aptitude search <package-name-pattern> | search for packages which match <package-name-pattern> | ||
aptitude download <package-name> | downloads the .deb file for the given package to the current directory | ||
aptitude --simulate <action> | print the actions that would normally be performed, but don't actually perform them. | ||
man deb | man page describing deb package format |
You may also want to use visual panels to communicate related information, tips or things users need to be aware of. |
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