Tips

When LinuxMint (19.1) wakes up it has a maximum brightness and I have to lower it manually each time, which is inconvenient. To fix it automatically I have done these:

• Created a script /usr/local/bin/fix-backlight.sh with a content like this:

  #!/bin/bash
  echo 368 > /sys/class/backlight/intel_backlight/brightness
  echo 51 > '/sys/class/leds/smc::kbd_backlight/brightness'
  

• Made it executable:

  chmod +x /usr/local/bin/fix-backlight.sh
  

• Created the service /etc/systemd/system/fix-backlight.service with a content like this:

  [Unit]
  Description=Run /usr/local/bin/fix-backlight.sh
  After=suspend.target hibernate.target hybrid-sleep.target
  
  [Service]
  ExecStart=/usr/local/bin/fix-backlight.sh
  
  [Install]
  WantedBy=suspend.target hibernate.target hybrid-sleep.target
  

• Enabled this service:

  systemctl enable fix-backlight.service
  

Reference: https://unix.stackexchange.com/questions/152039/how-to-run-a-user-script-after-systemd-wakeup

• https://blog.ssdnodes.com/blog/outline-vpn-tutorial-vps/

• https://proprivacy.com/guides/use-your-hosts-file-to-block-ads-and-malware
• https://github.com/StevenBlack/hosts

sudo wget https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts -O /etc/hosts

Edit /etc/systemd/resolved.conf and place this content:

[Resolve]
# Use Quad9.net DNS, and Cloudflare DNS.
# Both supports DNS over TLS and DNSSEC,
# and promises not to log DNS queries.
DNS=9.9.9.9 1.1.1.1 2620:fe::fe 2606:4700:4700::1111
FallbackDNS=149.112.112.112 1.0.0.1 8.8.8.8 8.8.4.4 \
            2620:fe::9 2606:4700:4700::1001 2001:4860:4860::8888 2001:4860:4860::8844
# Attempt to use DNS over TLS
DNSOverTLS=opportunistic
# Enforce DNSSEC validation.
DNSSEC=true

Then restart systemd-resolved.service:

systemctl restart systemd-resolved.service

Reference:

• https://www.ctrl.blog/entry/systemd-resolved.html

The command `apt upgrade` opens several download connections in parallel and sometimes this may be a problem because it saturates the network connections and bloks your work. It would be better if its download is less aggressive.

This can be improved with this setting:

echo 'Acquire::Queue-Mode "access";' >/etc/apt/apt.conf.d/75download

References:

• https://www.cyberciti.biz/faq/how-to-speed-up-apt-get-apt-command-ubuntu-linux/
• https://askubuntu.com/questions/88731/can-the-update-manager-download-only-a-single-package-at-a-time

• https://howtoraspberrypi.com/create-a-wi-fi-hotspot-in-less-than-10-minutes-with-pi-raspberry/

If you have installed `ufw` on the Raspberry Pi, make sure to edit `/etc/default/ufw` and to set `DEFAULT_FORWARD_POLICY="ACCEPT"`.

• https://github.com/kylemanna/docker-openvpn/blob/master/docs/docker-compose.md
• https://www.kennethballard.com/?p=4691

If you want to run this OpenVPN container on a RaspberryPi, you have to build the image yourself, like this:

git clone https://github.com/kylemanna/docker-openvpn
cd docker-openvpn
docker build -t kylemanna/openvpn .

mkdir -p /usr/share/fonts/truetype/Monaco
cd /usr/share/fonts/truetype/Monaco
wget https://github.com/mikesmullin/gvim/raw/master/.fonts/Monaco_Linux.ttf
fc-cache -f .

Reference:

• https://gitlab.com/docker-scripts/guacamole/-/blob/master/Dockerfile#L62

On ~/.bashrc uncomment force_color_prompt=yes and set PS1 like this:

PS1='${debian_chroot:+($debian_chroot)}\[\033[01;31m\]\u\[\033[01;33m\]@\[\033[01;36m\]\h \[\033[01;33m\]\w \[\033[01;35m\]\$ \[\033[00m\]'

• Make sure that the package bash-completion is installed:

  apt install bash-completion
  

• Make sure that these lines at the end of ~/.bashrc are uncommented:

  # enable programmable completion features (you don't need to enable
  # this, if it's already enabled in /etc/bash.bashrc and /etc/profile
  # sources /etc/bash.bashrc).
  if [ -f /etc/bash_completion ] && ! shopt -oq posix; then
      . /etc/bash_completion
  fi
  

nmcli r wifi on
nmcli r wifi off