linux notes¶

linux installer shell maker¶

How to disable gui when ubuntu desktop version booting¶

1. modify grub:

sudo vim /etc/default/grub

change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="text"

update grub

sudo update-grub

2. disable lightdm service

sudo systemctl disable lightdm.service

3. If you want to start desktop

sudo servie lightdm start

4. To enable lightdm service, systemd has bug! ref: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1595454 solution(root user or use sudo):

systemctl enable lightdm
ln -s /lib/systemd/system/lightdm.service /etc/systemd/system/display-manager.service

How to disable guest session¶

sudo vim /usr/share/lightdm/lightdm.conf.d/50-ubuntu.conf

add:

allow-guest=false

ubuntu 18.04 disable xorg using nvidia card!¶

ref: https://askubuntu.com/questions/1061551/how-to-configure-igpu-for-xserver-and-nvidia-gpu-for-cuda-work

create file /etc/X11/xorg.conf with the following content:

Section "Device"
  Identifier      "intel"
  Driver          "intel"
  BusId           "PCI:0:2:0"
EndSection

Section "Screen"
    Identifier      "intel"
    Device          "intel"
EndSection

fix time difference in Ubuntu & Windows Dual Boot¶

Ubuntu use the hardware clock (RTC, real time clock) in universal time (UTC) by default while Windows use the clock in local time.

easy solution in ubuntu

$ sudo timedatectl set-local-rtc 1