Ubuntu module blacklist

Edit blacklist.conf sudo gedit /etc/modprobe.d/blacklist.conf Add below statement at the end of the blacklist.conf blacklist [module name] Update ramfs and reboot sudo update-initramfs -u sudo reboot

Linux and Unix grep command

memo for frequently used command grep -nr "pattern you looking for" . Linux and Unix grep command

Change fonts on Ubuntu

Install unity-tweak-tool sudo apt install unity-tweak-tool

Install R on Ubuntu 16.04

Add R repository

sudo echo "deb http://cran.rstudio.com/bin/linux/ubuntu xenial/" | sudo tee -a /etc/apt/sources.list

Add R to Ubuntu Keyring

gpg --keyserver keyserver.ubuntu.com --recv-key E084DAB9 gpg -a --export E084DAB9 | sudo apt-key add -

Install R-base

sudo apt-get update sudo apt-get install r-base r-base-dev

Install GUI tool - Rstudio

sudo apt-get install gdebi-core wget https://download1.rstudio.org/rstudio-0.99.896-amd64.deb sudo gdebi -n rstudio-0.99.896-amd64.deb rm rstudio-0.99.896-amd64.deb

[Ubutnu] analyze system boot time

Simply execute the following command to see the detailed boot up time systemd-analyze blame

[Ubutnu] Create bridged network for qemu

Simple way to create bridged network between Ubuntu host and qemu client Install bridge-utils package first. sudo apt-get install bridge-utils Edit /etc/network/interfaces, and append the following configurations. Add a bridged network (br0) to your host network adapter (eth0)
------------------------
auto br0
iface br0 inet dhcp
 bridge_ports eth0
 bridge_stp off
 bridge_fd 0
 bridge_maxwait 0
------------------------
Restart your network. sudo /etc/init.d/networking restart Edit your script to boot qemu client, here is an example (-net nic, -net bridge,br=br0) qemu -net nic, -net bridge,br=br0 you are now ready to boot your qemu client with bridged network

[Ubutun] Repiar no sound problem on Ubuntu 16.04

Uninstall pulseaudio package

sudo apt-get purge pulseaudio

Remove the following files/folders

sudo rm -rf ~/.config/pulse /etc/pulse /usr/share/pulseaudio

Reboot you system

Reinstall pulseaudio package

sudo apt-get install pulseaudio

You might need to reinstall ubuntu-desktop if your 'Ubuntu System Settings' has disappeared

sudo apt-get install ubuntu-desktop