Debian

Configure WiFi with LXQt installation

$ connmanctl

connmanctl> scan wifi

connmanctl> services

connmanctl> agent on

connmanctl> connect wifi_<alphanumeric string>_managed_psk

Passphrase? Type in passphrase

connmanctl> quit

Note: You can use TAB key to autocomplete the wifi access point

Once connection is established, you can change settings on /var/lib/connman/

https://wiki.archlinux.org/index.php/ConnMan#Connecting_to_a_protected_access_point

Configure WiFi

Edit /etc/network/interfaces file and add:

auto wlp3s0

iface wlp3s0 inet dhcp

        wpa-ssid MOVISTAR_CFCD

        wpa-psk QlatrCMgyBpDGySYSekK

https://wiki.debian.org/WiFi/HowToUse#Command_Line

Add user to sudo

# usermod -aG sudo cheo

cheo must log out and log in again for the changes to take effect

Vi Editor:

# visudo

add this line:

cheo ALL=(ALL:ALL) ALL

How to update the whole system

sudo apt update

sudo apt upgrade

How to update a particular application

sudo apt update

sudo apt install --only-upgrade firefox

Invert desktop color

sudo apt install xcalib

xcalib -invert -alter

Install nVidia drivers

1. Add contrib and non-free to /etc/apt/sources.list
2. Issue these commands:
   • # apt-get update
   • # apt-get install linux-headers-$(uname -r|sed 's/[^-]*-[^-]*-//')
   • # apt-get update
   • # apt-get install nvidia-driver
3. The system will alert that there is a conflict with nouveau drivers. Just hit OK.
4. The system will take a while to load the modules necessary.

Export Wordpress site

SOURCE MACHINE

Compress/Decompress directory

• Compress: tar -czf example.tar.gz -C /var/www/example.com/public_html .
• Decompress: tar -xzf example.tar.gz -C wordpress

MariaDB

How to export database:

$ mysqldump -u wpuser -p example --single-transaction --quick --lock-tables=false > example-dump.sql

Send files to Destination Machine

• wp_importer
• database_name-dump.sql
• mydomain.tar.gz

DESTINATION MACHINE

• Create empty database:

$ sudo mariadb -u root -p

MariaDB> CREATE DATABASE example;

MariaDB> EXIT

• Add database to MariaDB:

$ mariadb -u wpuser -p example < example-dump.sql

• Execute bash script:

$ sudo ./wp_importer

• Restart LEMP:

$ sudo systemctl restart nginx php-fpm mariadb

You can login to Wordpress dashboard by navigating to: http://example.com/wp-admin

OpenSSH

Connect to remote machine:

$ ssh user@remote_machine_ip

Note: if the remote machine you used to ssh has been deleted and a new system has been installed in the same remote machine with the same user and IP address, issue this command:

ssh-keygen -f "/home/cheo/.ssh/known_hosts" -R "192.168.1.43"

Generate a Key Pair:

$ ssh-keygen

Copy the Public Key to remote machine:

$ ssh-copy-id

How to copy a file from local to remote (from local shell):

scp file_name user@remote_machine_ip:/home/remoteuser/

How to copy a file from remote to local (from local shell):

scp user@remote_machine_ip:file_name /home/localuser/

Lubuntu 18.10

Bloq Num enabled by default

Edit ~/.config/lxqt/session.conf and append the following lines:

[Keyboard]

numlock=true

How to install Nvidia drivers for GeForce GTX 960 graphic card

sudo apt install nvidia-driver-390

WARNING: Don't restart the computer after installation. Instead, follow next steps intermediately:

1. Edit /etc/default/grub so the following two lines end up like this:
   • GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nvidia-drm.modeset=1"
   • GRUB_CMDLINE_LINUX="nomodeset"
2. sudo update-grub

Installing OBS Studio

sudo apt install ffmpeg obs-studio 

OBS Studio and H4N recorder

1. Connect H4N recorder to computer through USB
2. Launch OBS
3. Launch PulseAudio Volume Control and be sure to set these settings:

How to add application to Application Launcher

Copy the application .desktop file into ~./local/share/applications folder. For instance:

• Add Blender into Application launcher:
  1. cp Downloads/Blender/blender.desktop .local/share/applications
  2. Edit the copied blender.desktop file and change the following line so it looks like this:
     • Exec=/home/cheo/Downloads/Blender/blender %f
  3. The icon will now appear in the Application Launcher, but it won't work. Restart the computer for the changes to take effect and work.

Creating a .desktop file

If the application folder doesn't contain any .desktop file, you can create one from scratch using this Blender template (replace Blender with your application):

[Desktop Entry]

Name=Blender

Exec=/home/cheo/Downloads/Blender/blender %f

Icon=blender

Type=Application

Categories=Graphics;3DGraphics

MimeType:application

The Icon file must be a valid .svg file. Note that the Exec file and the Icon file must be in the same folder.

GRUB v2

The configuration file is /boot/grub/grub.cfg, but you shouldn't edit it directly. This file is generated by grub v2's update-grub(8), based on:

1. The script snippets in /etc/grub.d/
2. The configuration file /etc/default/grub

To configure GRUB "v2", you should do any or both of these:

• edit /etc/default/grub, then run update-grub
• modifying the snippets in /etc/grub.d/

Also check the GRUB2 page for more detailed configuration instructions, ideas and suggestions.