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SaeHie Park edited this page Jul 17, 2022 · 104 revisions

256 color

add this to top of .profile file.

export TERM="xterm-256color"
  • to make tmux color working

check

$ tput colors
256

Network address

/etc/network/interfaces

example

auto enp0s5
iface enp0s5 inet static
	address 1.2.3.4
	netmask 255.255.255.0
	network 1.2.3.0
	broadcast 1.2.3.255
	gateway 1.2.3.1
	dns-nameservers 164.124.101.2 8.8.8.8

Initial programs

sudo apt-get update
sudo apt-get install ssh vim samba git build-essential cmake pkg-config
sudo apt-get install tree stop tmux
sudo apt-get install autoconf libtool
sudo apt-get install xutils-dev

SSH KEY Init

ssh-keygen -t rsa

Add client id_rsa.pub content to server ~/.ssh/authorized_keys

And fix file attribbute

chmod 600 ~/.ssh/authorized_keys

Time zone

sudo timedatectl set-timezone Asia/Seoul

Check

timedatectl

New storage disk

# partition
sudo fdisk /dev/sdb
# in fdisk
n: new partition
p: primary
1: partition 1
# and then First sector 2048, Last sector some number
w: write table to disk and exit

# format
sudo mkfs.ext4 /dev/sdb1

# /etc/fstab for mount
/dev/sdb1 /home/maxwell/u ext4 defaults 0 2

# mount all
sudo mount -a

show disks

lsblk -o +UUID,MODEL,MOUNTPOINT,SIZE

Swap on Ubuntu 18.04

# make 8G swap
sudo dd if=/dev/zero of=/var/swapfile bs=2048 count=4194304
sudo chmod 600 /var/swapfile

sudo swapoff -a
sudo mkswap /var/swapfile
sudo swapon /var/swapfile
grep SwapTotal /proc/meminfo

Edit /etc/fstab to reflect above changes

force fsck on reboot

sudo touch /forcefsck

and reboot

Samba

sudo smbpasswd -a maxwell
# don't copy above line. "-" is not what you are looking at.
sudo vi /etc/samba/smb.conf

For smb only accounts

# add dummy account
sudo adduser --no-create-home --disabled-password --disabled-login smbusername
# add smb account 
sudo smbpasswd -a smbusername

fix to preserve file attributes

add to global

[global]

nt acl support = no

add to share folder

[...]

map archive = no

fix execute file from windows

add to share folder

[...]

acl allow execute always = True

fix huge dir size in windows

add to global

[global]

allocation roundup size = 4096

from https://ubuntuforums.org/showthread.php?t=2268135

how to get block size ?

sudo dumpe2fs /dev/sda1 | grep -e 'Block size'

restart samba

sudo systemctl restart smbd

NFS

reference

nfs server

install package

sudo apt-get install nfs-kernel-server

/etc/exports file setting

/home/maxwell/usbdisk      192.168.1.0/255.255.255.0(rw,sync,no_subtree_check,no_root_squash)

where set 192.168.1.0 to your client IP sub net

If you want to make the client write as UID/GUID(1000/1000) of the NFS server which has different UID/GUID in the client

/home/maxwell/usbdisk 192.168.1.0/255.255.255.0(anonuid=1000,anongid=1000,rw,sync,no_subtree_check,no_root_squash,all_squash)

Add anonuid=1000,anongid=1000,all_squash

service check, start if not running

sudo service nfs-kernel-server status
sudo service nfs-kernel-server start

reload configuration

sudo exportfs -r

check status

rpcinfo -p

nfs client

package

sudo apt-get install nfs-common

mount

sudo mount 192.168.1.10:/home/maxwell/usbdisk /home/maxwell/usbdisk

where change 192.168.1.10 to your NFS server IP

NTP time sync

install package

sudo apt-get install ntpdate

sync time

sudo ntpdate ntp.ubuntu.com

Boot X, Non-X ubuntu 16.04

Text

sudo systemctl set-default multi-user.target

X dm

sudo systemctl set-default graphical.target

Get

sudo systemctl get-default

Reinstall

sudo apt-get install --reinstall ubuntu-desktop

Web server

https://www.stewright.me/2012/09/tutorial-install-apache-php-and-mysql-on-raspberry-pi/

sudo apt-get install apache2 apache2-doc apache2-utils
sudo apt-get install libapache2-mod-php php php-pear
sudo apt-get install php-mysql
sudo apt-get install mysql-server mysql-client

for Raspbian

sudo apt-get install apache2 apache2-doc apache2-utils
sudo apt-get install php php-pear
sudo apt-get install php7-mysql libapache2-mod-php7 php7-xcache
sudo apt-get install mysql-server mysql-client

Bigger font size for mobile view of directory listing

  1. Add mobile.conf at conf-available folder with 
    IndexHeadInsert "<meta name='viewport' content='width=device-width, initial-scale=1'>"
  2. Make an alias of this file in conf-enabled folder
  3. restart apache2

Change logon welcome message

cd /etc/update-motd.d/

Edit whatever the files inside

Adding new user

sudo adduser newuser

Development tools

sudo apt-get install cmake ninja-build
sudo apt-get install qemu qemu-user-static binfmt-support debootstrap
sudo apt-get install libxml2-dev libxml2-utils python2.7-dev
sudo apt-get install swig libunwind8-dev liblttng-ust-dev uuid-dev
# clang
sudo apt-get install clang-3.9 liblldb-3.9-dev
# sudo apt-get install clang-3.8 lldb-3.8-dev

# for arm
sudo apt-get install binutils-arm-linux-gnueabihf
sudo apt-get install gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf
# for armel
sudo apt-get install libc6-armel-cross libc6-dev-armel-cross
sudo apt-get install binutils-arm-linux-gnueabi

Python 2.x, 3.x use both

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 10
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 20

# choose
sudo update-alternatives --config python

Sites

When something goes wrong with package install

sudo dpkg --configure -a

sudo dpkg -P --force-depends [package] [package] ...
sudo apt clean
sudo apt -f install
sudo apt install [package] [package] ...

Drivers

nvidia

Check this: nvidia page

annoying things

Storage is keep doing things...

sudo chmod -x /etc/cron.daily/mlocate

disable auto update

sudo apt-get remove unattended-upgrades

sudo touch /etc/cloud/cloud-init.disabled

To disable ALT or Window key to show search menu

  • http://askubuntu.com/questions/122209/how-do-i-modify-or-disable-the-huds-use-of-the-alt-key
    • Settings > Keyboard > Shortcuts > "Key to show the HUD" >> "BACKSPACE" to disable it
    • Search "compizconfig-settings-manager" in software center
      • Ubuntu Unity Plugin > "Key to show the menu bar while pressed" >> disable it
      • And in Launcher tab, "Key to show the Dash, Launcher and Help Overlay" >> disable it
      • To disable, click on the button and uncheck "Enabled" checkbox
    • Reboot

DNS settings

  • edit /etc/resolvconf/resolv.conf.d/head file
  • update resolve file
sudo resolvconf --enable-updates
sudo resolvconf -u
  • check
nslookup
> server

updatedb.mlocate

Running in my Linux... and makes my HDD busy...

  • updatedb - update a database for mlocate
  • locate - find files by name

CUPS printer server

Refer http://blog.pi3g.com/2013/08/using-the-raspberry-pi-as-cups-print-server-for-windows-and-apple-mac-airprint/

Remove old kernel packages

dpkg --list | grep linux-image
sudo apt-get --purge remove linux-image-4.4.0-2*
...
sudo apt-get --purge remove linux-image-extra-4.4.0-2*
...
sudo update-grub2
sudo systemctl reboot

Remove programs eating up memory

sudo apt-get remove gnome-software
sudo apt-get purge gnome-software

# can remove in 16.04
sudo apt-get remove evolution-data-server

# desktop logged on but no app running and ssh connected
$ free
              total        used        free      shared  buff/cache   available
Mem:        4037772      361320     3157348       11612      519104     3404660
Swap:       4192252           0     4192252

For Raspberry Pi 2 running Ubuntu 16.04

sudo apt-get remove snapd

coredump in some other folder

echo '/home/maxwell/u/tmp/core_%e.%p' | sudo tee /proc/sys/kernel/core_pattern

Reference

Server in text mode

To change text console size... open /etc/default/grub and

GRUB_CMDLINE_LINUX_DEFAULT="text"  
GRUB_CMDLINE_LINUX="text"

and then run update-grub and reboot

sudo update-grub
sudo reboot

gdb segment fault in Ubuntu 16.04 ARM

(gdb) r
Starting program: /home/.../hello 

Program received signal SIGSEGV, Segmentation fault.
0x76fd9822 in ?? () from /lib/ld-linux-armhf.so.3

Need to install libc debug files

sudo apt-get install libc6-dbg

JDK

First, download the JDK

Then, Install

sudo mkdir -p /usr/lib/jvm
cd /usr/lib/jvm
sudo tar xvf ~/Download/jdk-8u144-linux-x64.tar.gz 

sudo ln -s jdk1.8.0_131 jdk
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk/bin/javac" 1
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk/bin/java" 1

Add to envioronment

export JAVA_HOME=/usr/lib/jvm/jdk

Proxy

environment

vi ~/.profile

export HTTP_PROXY=http://127.0.0.1:8080/
export HTTPS_PROXY=http://127.0.0.1:8080/

why HTTPS_PROXY=http:// ?

apt

vi /etc/apt/apt.conf.d/90proxy

Acquire::http::proxy "http://127.0.0.1:8080/";
Acquire::https::proxy "http://127.0.0.1:8080/";
Acquire::ftp::proxy "ftp://127.0.0.1:8080/";

wget

vi ~/.wgetrc

use_proxy=yes
http_proxy=127.0.0.1:8080
https_proxy=127.0.0.1:8080

ref: https://stackoverflow.com/questions/11211705/setting-proxy-in-wget

git

git config --global https.proxy http://127.0.0.1:8080/
git config --global http.proxy http://127.0.0.1:8080/

Tweaking

Caps lock to Ctrl

sudo apt install gnome-tweak-tool

Gnome Tweaks -> Keyboard & Mouse -> Additional Layout Options -> Caps Lock key behavior.

Disable USB automounting

https://help.ubuntu.com/community/Mount/USB

1 Run

dconf-editor

2 Open

  • org - gnome - desktop - media-handling

3 Turn off/on switch

Corporate certificate

  • Go to /usr/local/share/ca-certificates/
  • Copy the .crt file
  • Permissions 644
  • sudo update-ca-certificates
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