No wifi adapter found on Linux Ubuntu 18.04

 Run this command:

rfkill

D TYPE      DEVICE      SOFT      HARD

 0 bluetooth hci0   unblocked unblocked

 1 wlan      phy0   unblocked unblocked

If the wlan is hardware blocked, need to goto BIOS settings and change the wireless adapter to enabled.

For example, the Asrock X399, need to goto the BIOS and find South Bridge to change the wireless from Auto to Enabled. 

Qt related knowledge

sudo apt install qt5-default

File paths:

/usr/lib/x86_64-linux-gnu/qt5/qt.conf: contains a list of file paths.

[Paths]

Prefix=/usr

ArchData=lib/x86_64-linux-gnu/qt5

Binaries=lib/qt5/bin

Data=share/qt5

Documentation=share/qt5/doc

Examples=lib/x86_64-linux-gnu/qt5/examples

Headers=include/x86_64-linux-gnu/qt5

HostBinaries=lib/qt5/bin

HostData=lib/x86_64-linux-gnu/qt5

HostLibraries=lib/x86_64-linux-gnu

Imports=lib/x86_64-linux-gnu/qt5/imports

Libraries=lib/x86_64-linux-gnu

LibraryExecutables=lib/x86_64-linux-gnu/qt5/libexec

Plugins=lib/x86_64-linux-gnu/qt5/plugins

Qml2Imports=lib/x86_64-linux-gnu/qt5/qml

Settings=/etc/xdg

Translations=share/qt5/translations

How to increase font line space

for i in `ls *.ttf`; do echo $i; font-line percent 130 $i; done

https://github.com/source-foundry/font-line

¯\_(ツ)_/¯

网易云音乐 Netease Cloud Music登录不能保持

find ~/.config/netease-cloud-music -exec sudo chown $USER:$USER {} +
find ~/.config/netease-cloud-music -exec sudo chmod 755 {} +
find ~/.cache/netease-cloud-music -exec sudo chown $USER:$USER {} +
find ~/.cache/netease-cloud-music -exec sudo chmod 755 {} +

Ubuntu 18.04 fix mouse and fix wifi

If the bluetooth mouse doesn't work properly:
sudo add-apt-repository ppa:bluetooth/bluez
sudo apt install bluez

To fix it temporarily:
#!/bin/bash
sudo service bluetooth restart

If the WIFI adapter is lost after resume or hibernation:
#! /bin/bash

# Little sleep for safety (??)
sleep 5;

# Remove all of the wifi modules from the kernel
sudo modprobe -r mwifiex_pcie;
sudo modprobe -r mwifiex;
sudo modprobe -r cfg80211;

# Re-add all of the wifi modules
sudo modprobe -i cfg80211;
sudo modprobe -i mwifiex;
sudo modprobe -i mwifiex_pcie;

# Restart netmanager
sudo service NetworkManager restart;

Enable Ubuntu 18.04/22.04 hibernate

To make things easy: create a swap drive instead of using a swap file.

In the BIOS settings: disable secure boot FIRST.

Then follow: https://www.geeksforgeeks.org/how-to-enable-hibernate-in-ubuntu-22-04-lts/

Edit the file /etc/systemd/sleep.conf with the following configuration:

[Sleep]
HibernateMode=shutdown

Enable the hibernation menu:

sudo gedit /etc/polkit-1/localauthority/50-local.d/com.ubuntu.desktop.pkla

[Enable hibernate in upower]
Identity=unix-user:*
Action=org.freedesktop.upower.hibernate
ResultActive=yes
 
[Enable hibernate in logind]
Identity=unix-user:*
Action=org.freedesktop.login1.hibernate;org.freedesktop.login1.handle-hibernate-key;org.freedesktop.login1;org.freedesktop.login1.hibernate-multiple-sessions;org.freedesktop.login1.hibernate-ignore-inhibit
ResultActive=yes