Ubuntu 22.04
============


Disable IPv6
------------
https://www.linuxbabe.com/ubuntu/disable-ipv6-on-ubuntu

Settings
    Network
        [gear icon]
            IPv6
                (o) Disable
                (o) Link-Local Only  (if needed)

sudo systemctl restart NetworkManager



OS Version
----------
uname -a
cat /etc/os-release
lsb_release -a



Software & Updates
------------------
Software & Updates (blue icon)
    Updates
        Automatically check for updates:    Never
        Notify me of a new ubuntu version:  Never



Unistall
--------
type <application>
which <application>

# snap
snap list
sudo snap remove --purge firefox

# apt
apt list --installed | grep {app}
sudo apt remove --purge firefox
sudo apt remove --purge thunderbird
sudo apt remove --purge libreoffice-*

sudo apt autoremove --purge     # removes dependencies no longer used

sudo apt clean                  # erase downloaded archive files
sudo apt autoclean              # erase old downloaded archive files



Updates
-------
sudo apt update
sudo apt upgrade

# snap
sudo snap refresh

# flatpak
# https://flatpak.org/setup/Ubuntu
sudo apt install flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
flatpak update



Configs
-------
# ~/.bashrc
# /etc/bash.bashrc
#
# https://manpages.ubuntu.com/manpages/jammy/man1/tput.1.html
#
alias ll='ls -l'

alias cls='tput reset'
alias uu='sudo apt update && sudo apt upgrade -y'
alias ip='ip -color'


# ~/.inputrc
# /etc/inputrc
#
# https://askubuntu.com/questions/87061/can-i-make-tab-auto-completion-case-insensitive-in-bash
#
set completion-ignore-case on


# ~/.nanorc
# /etc/nanorc
#
# https://stackoverflow.com/questions/11173769/how-to-make-the-tab-character-4-spaces-instead-of-8-spaces-in-nano
#
set tabsize 4
set tabstospaces
set linenumbers



VirtualBox
----------
sudo apt install perl build-essential
sudo apt install libxt6 libxmu6         # only server

# installation
Devices
    Insert Guest Additions CD image...

# run script
sudo bash VBoxLinuxAdditions.run
sudo adduser $USER vboxsf

# screen flickering
Log Out
    click on the name
        right bottom corner
            Ubuntu on Xorg



Install
-------

# usefull tools
sudo apt install htop
sudo apt install neofetch
sudo apt install tmux


# wallpapers
sudo apt install ubuntu-wallpapers*
sudo apt install ubuntu-wallpapers-xenial


# ssh
sudo apt install openssh-server
sudo systemctl enable ssh
sudo systemctl start ssh

    # generate authentication keys
    ssh-keygen -t rsa -b 4096
    ssh-keygen -t ed25519

    # copy public key (windows)
    mkdir ~/.ssh
    type <public_cert> | ssh <user>@<server> "cat >> ~/.ssh/authorized_keys"
    chmod 0600 ~/.ssh/authorized_keys

    # copy public key (linux)
    ssh-copy-id -i <public_cert> <user>@<server>

    # backup sshd configuration
    sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak0

    # configuration
    sudo nano /etc/ssh/sshd_config
    ```
    PermitRootLogin no
    PasswordAuthentication no
    KbdInteractiveAuthentication no
    UsePAM no
    ```

    # restart deamon
    sudo systemctl restart sshd

    # connect
    ssh <user>@<server> -i <cert-file>


# git
sudo apt install git git-lfs gitk
git --version
git lfs version
gitk

    # configuration
    git config --global user.name "{name}"
    git config --global user.email "{email}"

    git config --global alias.co checkout
    git config --global alias.br branch
    git config --global alias.ci commit
    git config --global alias.st status
    git config --global alias.ff "pull --ff-only"

    git config --global alias.sui "submodule update --init --recursive"

    git config --global alias.lg "log --oneline"
    git config --global alias.lg "log --graph --pretty=format:'%Cred%h%Creset %ad %s %C(yellow)%d%Creset %C(bold blue)<%an>%Creset' --date=short"

    git config --global alias.df difftool
    git config --global alias.mod "diff --name-only --relative"
    git config --global alias.fomm "fetch origin master:master"
    git config --global alias.root "rev-parse --show-toplevel"
    git config --global alias.ka '!gitk --all&'

    git config --global pull.ff only

    git config --global core.editor "nano -w"

    git config --global init.defaultBranch master

    git config --global credential.helper store

    git lfs install

    # git credential manager
    # https://github.com/git-ecosystem/git-credential-manager/blob/release/docs/install.md
    #
    # Linux
    #   Debian package
    #     Download the latest .deb package
    #
    sudo apt install ./gcm-linux_amd64.2.6.0.deb
    git-credential-manager configure

    # credential stores
    # https://github.com/git-ecosystem/git-credential-manager/blob/release/docs/credstores.md
    #
    git config --global credential.credentialStore gpg              # requires gpg, pass, and a GPG key pair
    # OR
    git config --global credential.credentialStore plaintext


# python
sudo apt install python-is-python3 python3-pip
sudo apt install python3.10-venv

python --version
python3 --version
python -m pip --version
python -m venv --help


# gcc, make
sudo apt install build-essential gdb
gcc --version
gdb --version
make --version


# network
sudo apt install wireshark
    Should non-superusers be able to capture packets?
    <yes>

sudo dpkg-reconfigure wireshark-common
sudo adduser $USER wireshark

sudo apt install net-tools
sudo apt install bridge-utils
sudo apt install traceroute


# remote desktop (RDP)
sudo apt install xrdp


# other tools
sudo apt install curl
sudo apt install shellcheck
sudo apt install mc
sudo apt install gparted
sudo apt install wine64
sudo apt install meld
sudo apt install vlc

sudo apt install fortune cowsay lolcat
sudo apt install cmatrix cmatrix-xfont


# google chrome
#
# Install Google Chrome on Ubuntu
# https://itsfoss.com/install-chrome-ubuntu
#
# Chrome asks for password to unlock keyring on startup
# https://askubuntu.com/questions/31786/chrome-asks-for-password-to-unlock-keyring-on-startup
#   open Chrome
#   close
#   rm ~/.local/share/keyrings/*
#   open Chrome again
#   leave blank, continue, continue
#
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo apt install ./google-chrome-stable_current_amd64.deb


# vscode
#
# Download Visual Studio Code
# https://code.visualstudio.com/download
#
wget --trust-server-names https://update.code.visualstudio.com/latest/linux-deb-x64/stable
sudo apt install ./<package>

# vscode themes
#   - Dark (Visual Studio)
#   - Dark (Visual Studio - C/C++)
#   - GitHub Dark

# vscode extensions
#   - Remote - SSH (Command Pallete: remote install)
#   - Python
#   - Markdown All in One
#   - C/C++ Extension Pack
#       * C++
#       * C++ Themes
#       * CMake
#       * CMake Tools
#
#   - Makefile Tools
#   - Doxygen Documentation Generator
#   - PRACTICE
#   - Hex Editor
#   - XML (Red Hat)
#
#   - Git Extension Pack (Don Jayamanne)
#       * Git History (git log)
#       * Project Manager
#       * GitLens
#       * gitignore
#       * Open in GitHub / Bitbucket / VisualStudio.com
#   - Jinja Extension Pack (Sugato Ray)
#       * Python
#       * Jinja
#       * BetterJinja
#       * Visual Studio IntelliCode
#       * Python Docstring Generator
#       x Python Preview
#
#   - PlatformIO IDE


# sublime
#
# Download
# https://www.sublimetext.com/download
#   direct downloads
#      64 bit .deb


# zoom
#
# Download Center
# https://zoom.us/download


# docker
#
# Install Docker Engine on Ubuntu
# https://docs.docker.com/engine/install/ubuntu/#install-using-the-convenience-script
curl -fsSL https://get.docker.com -o get-docker.sh
sudo sh get-docker.sh --dry-run
sudo sh get-docker.sh

sudo docker run hello-world



Applications
------------

Additional Drivers
Language Support



Settings
--------

Background

Appearance
    Size                        [Normal]
    Position of New Icons       [Top Left]
    Show Personal folder        [OFF]

Region & Language
    Language    English (United States) / Čeština (Česko)
    Formats     Česko
    ---
    [Manage Installed Languages]
        Language
            English (United States)
            English
            čeština

            (přesunout na první místo)
            [Apply System-Wide]

        Regional Formats
            čestina
            [Apply System-Wide]

Keyboard
    Input Sources
            English (US)
        [+] Czech

    Keyboard Shortcuts
        Settings        (Super + I)


Switch Keyboard Input (Alt+Shift)
gsettings set org.gnome.desktop.wm.keybindings switch-input-source "['<Alt>Shift_L']"
gsettings set org.gnome.desktop.wm.keybindings switch-input-source-backward "@as []"



Finish line
-----------

clean "Download" folder
links in favorites

sudo apt autoremove --purge



--------------------------------------------------------------------------------

Bridge
```
sudo ip link add br0 type bridge
sudo ip link set br0 up
```

Dummy interface
```
sudo ip link add dummy0 type dummy
sudo ip link set dummy0 up
```

Virtual CAN
```
sudo modprobe vcan
sudo ip link add vcan0 type vcan
sudo ip link set vcan0 up
```



--------------------------------------------------------------------------------

Desktop on an Ubuntu Server
---------------------------

F1  help
F2  shell

----

F2
    ip -c a

----

sudo apt update
sudo apt upgrade
sudo snap refresh

reboot

----

sudo apt install ubuntu-desktop-minimal

/etc/cloud/cloud.cfg.d/99-disable-network-config.cfg
```
network:
  config: disabled
```

/etc/netplan/01-network-manager-all.yaml
```
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager
```
sudo chmod 0600 /etc/netplan/01-network-manager-all.yaml
sudo netplan generate

sudo systemctl disable systemd-networkd

reboot



Netplan config generated by cloud-init
--------------------------------------

/etc/netplan/50-cloud-init.yaml
```
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        enp0s3:
            dhcp4: true
    version: 2
```



--------------------------------------------------------------------------------

Auto-mount
----------

run 'Disks'
    choose disk
    choose partition
        Additional partition options (gear icon)
            Edit Mount Options...
            	[ ] User Session Defaults
                    [ ] Mount at system startup

# make symlink to mount point
ln -s {mount_point} {link_name}

----

sudo mkdir /media/win-ntfs

sudo fdisk -l
sudo blkid

cat /etc/fstab
    # fat32 (during installation)
    UUID=xxxxxx  /media/win-fat32 vfat    utf8,umask=007,gid=46 0       1
    # ntfs (during installation)
    UUID=xxxxxx  /media/win-ntfs ntfs    defaults,umask=007,gid=46 0       0

# test if everything is ok
# do NOT restart the computer if an error pops up, boot might not run properly

sudo mount -a



Time Windows-Linux Dual Boot
----------------------------

https://itsfoss.com/wrong-time-dual-boot/

timedatectl set-local-rtc 1



Microsoft TrueType Fonts
------------------------

https://itsfoss.com/install-microsoft-fonts-ubuntu/

# installation
sudo add-apt-repository multiverse
sudo apt update
sudo apt install ttf-mscorefonts-installer

# update font cache
sudo fc-cache -f -v

# reinstallation (in case you accidentally reject the license agreement)
sudo apt reinstall ttf-mscorefonts-installer