sudo apt-get update sudo apt-get install apt-transport-https ca-certificates gnupg software-properties-common wget wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor - | sudo tee /etc/apt/trusted.gpg.d/kitware.gpg >/dev/null For Ubuntu Focal Fossa (20.04):

sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ focal main' sudo apt-get update For Ubuntu Bionic Beaver (18.04):

sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main' sudo apt-get update For Ubuntu Xenial Xerus (16.04):

sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ xenial main' sudo apt-get update

sudo apt-get install kitware-archive-keyring sudo rm /etc/apt/trusted.gpg.d/kitware.gpg

To install gcc-6 (gcc-6.1.1), I had to do more stuff as shown below. USE THOSE COMMANDS AT YOUR OWN RISK. I SHALL NOT BE RESPONSIBLE FOR ANYTHING. ABSOLUTELY NO WARRANTY.

If you are still reading let's carry on with the code.

sudo apt-get update &&
sudo apt-get install build-essential software-properties-common -y &&
sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y &&
sudo apt-get update &&
sudo apt-get install gcc-snapshot -y &&
sudo apt-get update &&
sudo apt-get install gcc-6 g++-6 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-6 60 --slave /usr/bin/g++ g++ /usr/bin/g++-6 &&
sudo apt-get install gcc-4.8 g++-4.8 -y &&
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.8;

When completed, you must change to the gcc you want to work with by default. Type in your terminal: sudo update-alternatives --config gcc

To verify if it worked. Just type in your terminal gcc -v

/usr/bin/cmake --no-warn-unused-cli -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=MinSizeRel -DCMAKE_C_COMPILER:FILEPATH=/bin/gcc-8 -DCMAKE_CXX_COMPILER:FILEPATH=/bin/g++-8 -H/home/pi/HLC_TestTool -B/home/pi/HLC_TestTool/build -G "Unix Makefiles"

sudo add-apt-repository ppa:ubuntu-toolchain-r/test sudo apt-get update sudo apt-get install gcc-X g++-X gcc-X --version

The best way to correctly install gcc-4.9 and set it as your default gcc version use:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test sudo apt-get update sudo apt-get install gcc-4.9 g++-4.9 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 60 --slave /usr/bin/g++ g++ /usr/bin/g++-4.9

Then you can check which one that is set, and change back and forth using:

sudo update-alternatives --config gcc

wget https://dl.bintray.com/boostorg/release/1.75.0/source/boost_1_75_0.tar.bz2 --proxy-user=[user] --proxy-password=[pass] --no-check-certificate

tar --bzip2 -xf /path/to/boost_1_75_0.tar.bz2

apt-get install libboost-dev apt-get install libboost-system-dev

sudo apt install hostapd dnsmasq sudo systemctl unmask hostapd sudo systemctl enable hostapd sudo DEBIAN_FRONTEND=noninteractive apt install -y netfilter-persistent iptables-persistent

sudo nano /etc/dhcpcd.conf interface wlan0 static ip_address=192.168.4.1/24 nohook wpa_supplicant

sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.origin

sudo nano /etc/dnsmasq.conf interface=wlan0 # Listening interface dhcp-range=192.168.4.2,192.168.4.20,255.255.255.0,24h # Pool of IP addresses served via DHCP domain=wlan # Local wireless DNS domain address=/gw.wlan/192.168.4.1 # Alias for this router

sudo rfkill unblock wlan

sudo nano /etc/hostapd/hostapd.conf country_code=GB interface=wlan0 ssid=NameOfNetwork << ten hw_mode=g channel=7 macaddr_acl=0 auth_algs=1 ignore_broadcast_ssid=0 wpa=2 wpa_passphrase=AardvarkBadgerHedgehog << pass wpa_key_mgmt=WPA-PSK wpa_pairwise=TKIP rsn_pairwise=CCMP

sudo systemctl reboot