1. Download ISO file:
https://www.debian.org/

2. Create bootable install pendrive:
- open "Gnome Disks" software. 
- select Pendrive 
- Top
right menu (3 bars icon) → "Restore Disk Image"
- Select downloaded debian.iso file and hit OK
- This will delete all your files on pendrive and make install pendrive.

3. Reboot your computer, and boot from USB (Press F2, F12 or F9 during boot and select USB)
4. Install Debian. Select "Fully erase disk and create encrypted lvm"

Post-Installation Setup

 Once debian is installed, follow these instructions to configure and install the needed software. 
 
 Save this file on a pendrive and paste the commands as you see fit. 
 
 Notes: Whenever there is a # at the beginning of a line, it means it is a comment for you. Normal lines you can just paste in the terminal.

Oneliners

Oneliner Debian 12:

Open Terminal, become root (su), and paste the following command: (it opens software sources configurator and downloads
needed software. Tick all three first tickboxes in software configurator and hit OK (this will load non-free and contrib
sources): 

• apt-get install software-properties-gtk gedit lsb-release sudo nano qemu-kvm libguestfs-tools aptitude wget dialog
  libcanberra-gtk-module htop curl lshw firmware-brcm80211 broadcom-sta-dkms libavcodec-extra gstreamer1.0-plugins-ugly
  libavcodec-extra vlc thunderbird inkscape gparted lifeograph simple-scan xbindkeys qemu-kvm sshfs sshuttle duplicity
  deja-dup faenza-icon-theme pm-utils epiphany-browser gpm guake vlc simple-scan espeak inkscape guake gedit
  ttf-mscorefonts-installer texlive-fonts-extra pdfshuffler gthumb dialog rsync unattended-upgrades vlc pdfshuffler
  espeak borgbackup exfatprogs exfat-fuse guake parcellite hunspell-fr libreoffice-l10n-fr hunspell-en-us hunspell-en-gb
  libreoffice-l10n-en-gb libreoffice-l10n-de hunspell-de-ch hunspell-es thunderbird-l10n-de thunderbird-l10n-es-es
  thunderbird-l10n-fr thunderbird-l10n-it firmware-linux-nonfree dnsutils chromium foomatic-db seahorse-nautilus
  gnome-shell* nautilus-extension-gnome-terminal exiftool bash-completion kdenlive linux-cpupower kcachegrind unison
  sshpass libstring-mkpasswd-perl xournal

Oneliner Debian 10 / Debian 11:

Open Terminal, become root (su), and paste the following command: (it opens software sources configurator and downloads
needed software. Tick all three first tickboxes in software configurator and hit OK (this will load non-free and contrib
sources): 

• apt-get install software-properties-gtk gedit lsb-release sudo nano qemu-kvm libguestfs-tools aptitude wget
  dialog libcanberra-gtk-module htop curl lshw firmware-brcm80211 broadcom-sta-dkms libavcodec-extra
  gstreamer1.0-plugins-ugly libavcodec-extra vlc thunderbird inkscape gparted lifeograph simple-scan xbindkeys qemu-kvm
  sshfs sshuttle duplicity deja-dup faenza-icon-theme pm-utils epiphany-browser gpm guake vlc simple-scan espeak
  inkscape guake gedit ttf-mscorefonts-installer texlive-fonts-extra pdfshuffler gthumb dialog rsync
  unattended-upgrades vlc pdfshuffler espeak borgbackup exfat-utils exfat-fuse guake parcellite hunspell-fr
  libreoffice-l10n-fr hunspell-en-us hunspell-en-gb libreoffice-l10n-en-gb libreoffice-l10n-de hunspell-de-ch
  hunspell-es thunderbird-l10n-de thunderbird-l10n-es-es thunderbird-l10n-fr thunderbird-l10n-it firmware-linux-nonfree
  dnsutils chromium foomatic-db seahorse-nautilus gnome-shell* nautilus-extension-gnome-terminal exiftool
  bash-completion kdenlive linux-cpupower kcachegrind unison sshpass libstring-mkpasswd-perl xournal
• 
  

Detailed Post Installation Notes

 #Open up a terminal and become
root:
su
#enter password, hit [enter].

apt-get install gksu
software-properties-gtk gedit -y
gedit /etc/apt/sources.list

#save the file
#After save,
your file should look like this:

##################################################
# 
# deb
cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL Binary 20150908-22:02]/ jessie
main contrib non-free
# deb cdrom:[Debian GNU/Linux 8 _Jessie_ - Official Snapshot amd64 LIVE/INSTALL
Binary 20150908-22:02]/ jessie main contrib non-free
 
deb <a
href="http://httpredir.debian.org/debian">http://httpredir.debian.org/debian
jessie main contrib non-free
deb-src <a
href="http://httpredir.debian.org/debian">http://httpredir.debian.org/debian
jessie main contrib non-free
 
deb <a
href="http://httpredir.debian.org/debian">http://httpredir.debian.org/debian
jessie-updates main contrib non-free
deb-src <a
href="http://httpredir.debian.org/debian">http://httpredir.debian.org/debian
jessie-updates main contrib non-free
 
deb <a
href="http://security.debian.org/">http://security.debian.org/
jessie/updates main contrib non-free
deb-src <a
href="http://security.debian.org/">http://security.debian.org/
jessie/updates main contrib non-free
 
# deb <a
href="http://http.debian.net/debian">http://http.debian.net/debian
jessie-backports main
deb <a
href="http://http.us.debian.org/debian/">http://http.us.debian.org/debian/
jessie main non-free contrib
#########################################
 
#Then, run:
 
apt-get update
apt-get upgrade
 
#to update the system.

#install essentional
packages:
apt-get install lsb-release sudo nano qemu-kvm libguestfs-tools aptitude gksu wget dialog
libcanberra-gtk-module htop curl lshw 
apt install bash-completion

WIFI

Intel devices such as Will's laptop
apt-get install firmware-iwlwifi
#arnaud's laptop
wifi:
apt-get install firmware-realtek
#dell precision:
 apt-get install
firmware-iwlwifi
#urs old macbook air:
 apt-get install firmware-brcm80211
broadcom-sta-dkms
#to diagnose unknown hardware:
 apt-get install lshw && lshw -c
network

ZFS

Changed to backports: <a
href="https://github.com/zfsonlinux/zfs/wiki/Debian">https://github.com/zfsonlinux/zfs/wiki/Debian
OR:
wget
<a
href="http://archive.zfsonlinux.org/debian/pool/main/z/zfsonlinux/zfsonlinux_6_all.deb">http://archive.zfsonlinux.org/debian/pool/main/z/zfsonlinux/zfsonlinux_6_all.deb
dpkg
– i zfsonlinux_6_all.deb
wget <a
href="http://zfsonlinux.org/4D5843EA.asc">http://zfsonlinux.org/4D5843EA.asc
– O - | apt-key add -
apt-get update
apt-get install debian-zfs

#Install VLC and multimedia support

new: (missing)
old: 
apt-get install libavcodec-extra 
gstreamer0.10-plugins-ugly libavcodec-extra vlc -y
#libdvdcss2 is not available in the official Debian repositories.
Details on where to get libdvdcss2 from are described at =CDDVD=

#Font's and other SFCO software

#nonfree microsoft fonts
apt-get install icedove inkscape gparted
lifeograph simple-scan xbindkeys qemu-kvm sshfs sshuttle duplicity deja-dup faenza-icon-theme
pm-utils epiphany-browser gpm guake xul-ext-noscript enigmail vlc owncloud-client simple-scan
espeak inkscape guake gedit xul-ext-adblock-plus ttf-mscorefonts-installer texlive-fonts-extra pdfshuffler gthumb dialog
rsync unattended-upgrades vlc pdfshuffler espeak borgbackup exfat-utils exfat-fuse guake parcellite -y

#add unattended upgrade reconfigure and firewall

Todo

#swapfile

dd if=/dev/zero of=/swap bs=1024 count=8000000 #8gb
mkswap /swap 
chmod
600 /swap
swapon /swap 

#Add int nano
/etc/fstab:
#/swap none 
swap sw 0 0

#Keyboard

dpkg-reconfigure keyboard-configuration 

#Language packs, spellcheck (?)

apt-get install myspell-fr libreoffice-l10n-fr myspell-en-us myspell-en-gb
libreoffice-l10n-en-gb libreoffice-l10n-de myspell-de-ch myspell-es -y
#thunderbird languages
apt-get
install icedove-l10n-de icedove-l10n-es-es icedove-l10n-fr icedove-l10n-it -y
#also install languages
for iceweasel/firefox/openoffice.

#nvidia / video

apt-get install nvidia-detect -y
apt-get install nvidia-driver nvidia-xconfig
– y
nvidia-xconfig
or use nvidia install from Scripts. 

# if radeon: enable non-free
apt-get
install firmware-linux-nonfree

# nonfree kernel support *intel graphics
cards(
 apt-get install
firmware-linux-nonfree
 
 
More:
apt install
nautilus-extension-gnome-terminal

Configuration Checklist

install browser certs
system language
system keyboard
leafy
browser
cert
enigmail encryption
email
cloud
calendars
email accounts, incl. signatures and download/cache
settings
backup with deja dup
autoupdate for flash
viedo drivers
audio, video and
skype
hangout
encryption keys / enigmail
password-lock
autosuspend
dvd playback
zfs
phone
connection
usb file systems
scanner & printers setup
wifi pws and drivers
flash 
touchpad mate :
gsomething program fixes that
redshift
french browser
libdvdcss
disable unlock keyring (mate,
gnome)
check skype
check ghang
check spellcheck in libreoffice
spellcheck in icedove
video playback:
libdvdcss from deb multimedia precmpiled
zfs

Upgrade to Debian 9 Notes

replace sources list (jessie to stable)
sed -i
's/jessie/stretch/g' /etc/apt/sources.list
apt update
apt
dist-upgrade
#automated (replace all config files)
sudo apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" dist-upgrade