Christopher Juckins

SysAdmin Tips, Tricks and other Software Tools

User Tools

Site Tools


ubuntu_notes

Ubuntu Notes

20 Jul 2020

Updated VirtualBox to 6.1.12 and Ubuntu 18 would not login after MATE authentication screen (just got black screen). Went into /opt/VBoxGuestAdditions-6.1.8 and uninstalled the Guest Additions. Rebooted, logged in correctly. Then installed latest version of GuestAdditions. Rebooted again, logged in and all worked correctly.

If restarting makes the screen go black again, use CTRL-F in VirtualBox 2 times, and that restores it.

Other Notes

TeamViewer installation

LAMP on Ubuntu 18.04

General LAMP install

Firewall settings

Enabling root (or use sudo -i)

Release info:

lsb_release -a

View installed kernels:

# dpkg --list | grep linux-image

Remove old kernels:

Searching for Ubuntu Packages and versions

View installed packages:

# apt list --installed
# dpkg --get-selections | grep -v deinstall |grep unifi

Remove installed package:

# dpkg -r package_name

Ubuntu 18.04 LTS

  • After initial login, change preferences in terminal and remove undesired favorites
  • Allow Virtualbox guest additions:
sudo apt update
sudo apt install build-essential gcc make perl
sudo apt install vim
sudo apt install gnome-software
sudo apt install openssh-server
reboot

12 Sep 2019

Configure Apache HTTPS on Ubuntu 18

26 Jan 2019

Logging into Desktop GUI only gives a blank screen:

  • Tried updating VirtualBox Guest Additions to v5.2-5.2.24 but no change
  • Tried updating packages using commands below

Use these commands to update packages, as it allows interactive use to answer questions:

sudo apt update
sudo apt upgrade
sudo apt --with-new-pkgs upgrade

Very slow using Ubuntu GUI now:

Check that 3D acceleration is supported:

sudo apt install nux-tools
/usr/lib/nux/unity_support_test -p

Installing mysql:

sudo apt install mysql-client-core-5.7   
sudo apt install mysql-server
sudo /usr/bin/mysql_secure_installation

Then login like this:

sudo mysql -u root -p

Login with a non-root user like this:

mysql -u username -p

See notes at https://www.digitalocean.com/community/tutorials/how-to-install-mysql-on-ubuntu-18-04 for setting up a new user

Other SQL commands/testing:

CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON *.* TO 'username'@'localhost' IDENTIFIED BY 'password';
CREATE DATABASE dbname;
SET PASSWORD FOR 'username'@'localhost' = PASSWORD('password');

To fix this locale error upon login:

-bash: warning: setlocale: LC_ALL: cannot change locale (en_US)

run the following:

sudo locale-gen en_US
locale -a

and confirm you see en_US now. See https://ubuntuforums.org/showthread.php?t=1675347&page=2 for more info.


Ubuntu 14.04.5 LTS Notes

  • sudo apt-get install linux-headers-generic
  • sudo apt-get install apache2
  • sudo apt-get install mysql-server
  • sudo apt-get install php5 libapache2-mod-php5
  • sudo apt-get install gufw
  • sudo apt-get install php5-mcrypt
  • sudo apt-get install openssh-server openssh-client

Edit php.ini to include the following line:

extension=mcrypt.so

Restart apache:

sudo /etc/init.d/apache2 restart

Installing Ubuntu 12.04 LTS on VirtualBox

  • Choose download updates while installing
  • Choose to install 3rd party software
  • At first load, unlock unnecessary icons from launcher
  • Use sudo -i instead of root

Install VirtualBox Guest Additions

  • sudo apt-get install linux-headers-generic
    • Still reports current running kernel headers not installed
  • Guest Additions installed okay

Install MyUnity to tweak fonts

If you cannot manage Network connections (grayed out):

  • Manage some network settings through the System Settings Menu
  • Edit /etc/NetworkManager/NetworkManger.conf
    • Change line to managed=true
  • sudo service network-manager restart

Install and configure vpnc packages

Show Boot Messages

Install periodic updates:

  • You may be able to right-click a little icon in the upper right hand corner of the screen that looks like a gear cog. It should indicate status of pending updates.
  • From the command line, use: sudo apt-get update
  • Then a little icon called “Update Manager” will appear in left sidebar
  • Choose the files to update through that GUI

Download and install a .deb package:

  • Save the .deb file to some folder
  • sudo apt install ./name.deb
ubuntu_notes.txt · Last modified: 2020/07/29 09:45 by juckins