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How to numlockx on ubuntu 18.04

1. Open terminal via Ctrl+Alt+T, then run command to get root privilege:

   sudo -i
   

2. Switch to user gdm in the terminal:

   su gdm -s /bin/bash
   

3. Finally set ‘Numlock on’ via gdm user:

   gsettings set org.gnome.settings-daemon.peripherals.keyboard numlock-state 'on'
   

Restart the computer and done

site:  https://askubuntu.com/questions/1028428/how-to-set-numlock-on-as-default-at-login-screen

Lock builtin laptop keyboard but keep an external USB keyboard functioning

xinput list

is there USB KEYBOARD ?

sample
 USB KEYBOARD                                id=15    [slave  keyboard (3)]
and so write



xinput set-prop 15 "Device Enabled" 0

xinput set-prop 15 "Device Enabled" 1
 

That works!

https://askubuntu.com/questions/819148/lock-builtin-laptop-keyboard-but-keep-an-external-usb-keyboard-functioning 

How do I remove “Ubuntu” in the bios boot menu? (UEFI)

sudo apt-get install efibootmgr

sudo modprobe efivars

Then run sudo efibootmgr to check your boot entries

ex)

BootCurrent: 0004
Timeout: 2 seconds
BootOrder: 2001,0003,0005,0006,0000
Boot0000* Lenovo Recovery System
Boot0001* EFI Network 0 for IPv6 (B8-88-E3-84-F3-EF)
Boot0002* EFI Network 0 for IPv4 (B8-88-E3-84-F3-EF)
Boot0003* Windows Boot Manager
Boot0004* EFI USB Device (SanDisk)
Boot0005* ubuntu
Boot2001* EFI USB Device

sudo efibootmgr -b 5 -B 

https://askubuntu.com/questions/63610/how-do-i-remove-ubuntu-in-the-bios-boot-menu-uefi    

How to let `dpkg -i` install dependencies for me?

$ sudo dpkg -i package_with_unsatisfied_dependencies.deb
dpkg: dependency problems prevent ... 
[additional messages]

$ sudo apt-get -f install
[apt messages]
Setting up [dependency]...
Setting up package_with_unsatisfied_dependencies... 

https://askubuntu.com/questions/40011/how-to-let-dpkg-i-install-dependencies-for-me 

[SOLVED] Update Manager: Failed to get packages - Linux Mint Forums

sudo rm /var/lib/apt/lists/* -vf

sudo apt-get clean
sudo apt-get autoclean
sudo apt-get update
sudo apt-get upgrade

source: https://forums.linuxmint.com/viewtopic.php?t=193973  

ip time A2000ua driver install

$ lsusb

RTL8812AU 802.11a/b/g/n/ac WLAN Adapter

sudo apt update
sudo apt install git
git clone https://github.com/gnab/rtl8812au.git
sudo cp -r rtl8812au  /usr/src/rtl8812au-4.2.2
sudo dkms add -m rtl8812au -v 4.2.2
sudo dkms build -m rtl8812au -v 4.2.2
sudo dkms install -m rtl8812au -v 4.2.2

and reboot is it working?

https://askubuntu.com/questions/991643/rtl8812au-usb-adapter-driver-issues 

How to tell Chrome what to do with a magnet link on qbittorrent?

down vote

Worked very nice to open magnets from Chrome with qBitorrent in Ubuntu

$ xdg-mime default qBittorrent.desktop x-scheme-handler/magnet 

site: https://askubuntu.com/questions/108925/how-to-tell-chrome-what-to-do-with-a-magnet-link

install Tuxguitar

apt use Tuxguitar install

midi sound

sudo apt install tuxguitar-alsa tuxguitar-jsa tuxguitar-oss

go to Tools->Settings->Sound and select Gervill as Midi Port

https://askubuntu.com/questions/457321/tuxguitar-no-sound-in-14-04 

Ubuntu 16.04에서 FLAC(or APE)+CUE 파일 분할하기

$ sudo apt install cuetools shntool flac 

$ sudo apt-add-repository -y ppa:flacon
$ sudo apt update
$ sudo apt install -y flacon 

$ iconv -f shift_jis -t utf-8//IGNORE original.cue -o new.cue

$ cuebreakpoints new.cue
3:53.05
7:35.23
11:27.53

....

$ shnsplit -f new.cue -o flac -t "%n - %p - %t" original.flac
 

$ mkdir original
$ mv original.flac original/.

$ cuetag new.cue *.flac
 

https://item4.github.io/2016-09-08/Split-FLAC-with-CUE-on-Ubuntu-16_04/ 

3 Ways to Hide Confidential Data Inside Images in Linux

$ sudo apt-get install steghide

$ steghide embed -cf picture.jpg -ef secret.txt

$ steghide extract -sf picture.jpg 

https://www.maketecheasier.com/hide-confidential-data-inside-images-in-linux/