Linux links and tricks

01-Linux_Related

Linux links and tricks

fallback-kernel

http://askubuntu.com/questions/419152/install-older-kernel-in-a-server-and-made-it-the-default-boot-option-in-grub

Search for old kernels using
  dpkg -l | grep linux

Current version
  uname -r
  
For sub-menu selection, use
  cat /boot/grub/grub.cfg
  https://help.ubuntu.com/community/Grub2/Submenus

remove-all-packages

To remove all packages of a type

sudo apt-get remove --purge package-prefix*
sudo apt-get clean
sudo apt-get autoremove

e.g.:
sudo apt-get remove --purge libreoffice*
...

credit: http://askubuntu.com/questions/180403/how-to-uninstall-libreoffice

ubuntu-setup

Java
  https://adoptopenjdk.net/installation.html#linux-pkg

NodeJS
  https://github.com/nodesource/distributions/blob/master/README.md#debmanual

File Manager
  sudo apt install synaptic

Cockpit (System Manager)
  sudo apt install cockpit
  
  http://<host>:9090/

VI Settings (~/.vimrc)
  set nocompatible
  
For VirtualBox support, install Dynamic Kernel Module Support - so VBox modules are re-compiles on kernel upgrades
  sudo apt install dkms

Disable Suspend (does not work very well)
http://askubuntu.com/questions/452908/how-to-disable-suspend-in-14-04

Manage Services

To add a service to automatic startup system: ```sudo update-rc.d minidlna defaults```
But if you get: ```System start/stop links for /etc/init.d/minidlna already exist.```
Do the command: ```sudo update-rc.d minidlna enable```
http://askubuntu.com/questions/9382/how-can-i-configure-a-service-to-run-at-startup

Hide System Accounts from Login Screen
To hide a user named XXX, create a file named
/var/lib/AccountsService/users/XXX
containing two lines:
[User]
SystemAccount=true

credit: http://askubuntu.com/questions/92349/how-do-i-hide-a-particular-user-from-the-login-screen

VMWare

Shared Folders (if required)
https://wiki.archlinux.org/index.php/VMware/Installing_Arch_as_a_guest#Shared_Folders_with_vmhgfs-fuse_utility