Ubuntu

Links

• http://ubuntu.com
• https://linuxize.com/post/how-to-add-apt-repository-in-ubuntu/
• Ubuntu PPA

Security

Check kernel vulnerabilities

• Kernel on 22.04 LTS

Ubuntu security updates

• https://ubuntu.com/security/notices

Hardening Ubuntu

• Harden Ubuntu

Kernel

• https://launchpad.net/ubuntu/+source/linux

Installation

• Ubuntu server
• Ubuntu Netboot/PXE installation
• Uubntu mini iso for network install

Ubuntu 20.04 LTS

Storage configuration

First create a boot partition!

Remember to umount cdrom before rebooting

Automatic install

• https://ubuntu.com/server/docs/install/autoinstall
• Ubuntu Server 20.04 autoinstall
• Understanding the Ubuntu 20.04 LTS Server Autoinstaller
• Discourse - Please test autoinstalls for 20.04
• Cloudconfig examples

 

Documentation

Network configuration

• Configuring networks
• Netplan
• Ubuntu Phased Updates

APT new style

Is called deb822

• https://gist.github.com/Mealman1551/f75223b3cade0a218d51c06f6cb08f40

HOWTO

Upgrading Ubuntu

do-release-upgrade

Change nameservers

If using systemd-resolved

Show nameservers

resolvectl status

Edit /etc/netplan/00-installer-config.yaml

netplan apply

Using Ubuntu live CD for resque

• [https://help.ubuntu.com/community/LiveCdRecovery LiveCdRecovery

Download source code of package

Add to /etc/apt/sources.list.d/ubuntu.sources

Types: deb-src
URIs: http://us.archive.ubuntu.com/ubuntu/
Suites: noble noble-updates noble-backports noble-proposed
Components: main restricted universe multiverse
Signed-By: /usr/share/keyrings/ubuntu-archive-keyring.gpg

then update

apt-get update

and to get the sources

apt-get source somepackage

FAQ

Installing Ubuntu

https://ubuntu.com/server/docs/install/storage

Upgrading

Please install all available updates for your release before upgrading.

Double check

apt-get dist-upgrade

and you might even need to reboot

Set timezone

dpkg-reconfigure tzdata

Get ubuntu version

cat /etc/lsb-release
      

Where are the changelogs?

/usr/share/doc/*/changelog.Debian.gz

disable ipv6

sysctl:

net.ipv6.conf.default.disable_ipv6=1
net.ipv6.conf.all.disable_ipv6=1

changing locale

/etc/default/locale

locale-gen

dpkg-reconfigure keyboard-configuration

setupcon

loadkeys us

and lots more

 

 

mail: command not found

install heirloom-mailx

OR

install mailutils

REMEMBER: to fix sender domain

create /etc/mailutils.conf containing

address {
       email-domain yourdom.ain;
};

and check out

mail --config-help

The repository 'http://packages.ros.org/ros/ubuntu cosmic Release' does not have a Release file.

Switch path to repositories to old-releases.ubuntu.com

failed unmounting /var

ignore it? it's a journald issue

multipathd[667]: sda: failed to get sgio uid: No such file or directory

Seems to be vmware setting: disk.EnableUUID = true

CHECK!

 

The following signatures couldn't be verified because the public key is not available:

gpg --keyserver keyserver.ubuntu.com --recv-keys  9D6D8F6BC857C906

Seems this doesn't (always) work, so

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <yourkey>

which will complain about deprecation, but it should work

Upgrade to 22.04 (impish Release no longer has a Release file)

That sucks, now what? Check https://help.ubuntu.com/community/EOLUpgrades

When apt-get update fails, set your repositories to old-releases.ubuntu.com

Upgrades to the development release are only available from the latest supported release

More obscure mess. Check https://linuxconfig.org/how-to-upgrade-ubuntu-to-20-04-lts-focal-fossa

Not all translations for this language are installed.

Use the Install Missing Packages button to download and install all missing packages

Instead of trying to find that mysterious button, try

check-language-support

which will list missing packages

Release file not valid yet

Mirror not up to date?

Keep your own resolv.conf

Replace the symlink /etc/resolv.conf with a file

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 23E7166788B63E1E

apt-key adv --keyserver keyserver.ubuntu.com  --recv-keys 23E7166788B63E1E

Get into grub menu during boot

Hold shift key

Error messages

The repository 'http://archive.ubuntu.com/ubuntu jammy InRelease' is no longer signed.

Try again later?

Could not connect to archive.ubuntu.com:443

Doesn't support https, pick another mirror