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--- ubuntu_tips_tricks_and_notes [2024/12/24 10:40] – removed - external edit (Unknown date) 127.0.0.1
+++ ubuntu_tips_tricks_and_notes [2026/01/10 19:26] (current) – mike
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+====== Ubuntu Tips, Tricks and Notes ======
+----
+==== Mirrors ====
+The default mirror is **%%http://us.archive.ubuntu.com/ubuntu/%%**
+The preferred mirror is **%%http://mirrors.mit.edu/ubuntu/%%**
+==== Post-Installation ====
+Make the output of the **df** command more friendly and less cluttered by creating a system-wide alias for it:
+  echo "alias df='df -h -x squashfs -x tmpfs -x devtmpfs'" >> /etc/profile.d/aliases.sh
+Make sure to set the "always_set_home" variable in the sudoers file (using **visudo**)
+=== Disable IPv6 ===
+To disable IPv6 on Ubuntu during boot time, open the /etc/default/grub file using your favorite text editor with root privileges and change/add:
+  FROM:
+  GRUB_CMDLINE_LINUX_DEFAULT=""
+  GRUB_CMDLINE_LINUX=""
+  TO:
+  GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
+  GRUB_CMDLINE_LINUX="ipv6.disable=1"
+Once you have made the above change within the /etc/default/grub file execute the following command to apply the GRUB changes:
+  sudo update-grub
+Reboot the system afterwards.
+=== Enable console screen blanking ===
+Edit the /etc/default/grub file using your favorite text editor with root privileges and add the string **consoleblank=600** to the GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX lines for a 10-minute timeout.
+Once you have made the above change within the /etc/default/grub file execute the following command to apply the GRUB changes:
+  sudo update-grub
+Reboot the system afterwards.
+=== To install Samba: ===
+  sudo apt-get install samba cifs-utils
+=== To install NFS: ===
+  sudo apt-get install nfs-common nfs-kernel-server
+=== To install mysql: ===
+  sudo apt install mysql-server
+  sudo mysql_secure_installation
+=== Customizing the MOTD ===
+Put any customization data into /etc/motd
+=== Installing apache and php ===
+  sudo apt update
+  sudo apt install apache2
+  sudo apt install php libapache2-mod-php
+  sudo apt install php-mysql php-gd php-xml
+  sudo apt install phpmyadmin php-mbstring php-gettext
+=== Install phpmyadmin ===
+  sudo apt update
+  sudo apt install phpmyadmin php-mbstring php-zip php-gd php-json php-curl
+  sudo phpenmod mbstring
+  sudo systemctl restart apache2
+  mysql
+  mysql> SELECT user,authentication_string,plugin,host FROM mysql.user;
+  mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '<password>';
+=== Installing Portainer to manage Docker containers ===
+  sudo docker run -d -p 9443:9443 -p 8000:8000 --name portainer --restart=always -v /var/run/docker.sock:/var/run/docker.sock -v portainer_data:/data portainer/portainer-ce:latest
+=== Disable interactive restart prompt while upgrading packages with apt ===
+The trouble in this case is with the ''needrestart'' command, which is part of the apt-get upgrade process in Ubuntu now. By default this is set to “interactive” mode which causes the interruption of scripts.
+To change this behavior, we can edit the ''/etc/needrestart/needrestart.conf'' file, changing the line:
+''#$nrconf{restart} = 'i';''
+to
+''$nrconf{restart} = 'a';'' (if we want to restart the services automatically) or ''$nrconf{restart} = 'l';'' to simply list the services that need restart.
+==== Ubuntu Desktop (Gnome/GUI) Stuff ====
+=== Set login screen default resolution ===
+  - Login and set the screen resolution as desired.
+  - Once set, copy the file **~/.config/monitors.xml** to **/var/lib/gdm3/.config/monitors.xml**.
+  - Ensure the user/group ownership is set to **gdm.gdm**.
+  - Reboot the system to apply the changes.
+=== Eliminating the annoying repeated authentication dialogs when logging in via xrdp ===
+Edit the file **/etc/polkit-1/localauthority/50-local.d/45-allow-colord.pkla**; paste the following config into it and then save it:
+  [Allow Colord all Users]
+  Identity=unix-user:*
+  Action=org.freedesktop.color-manager.create-device;org.freedesktop.color-manager.create-profile;org.freedesktop.color-manager.delete-device;org.freedesktop.color-manager.delete-profile;org.freedesktop.color-manager.modify-device;org.freedesktop.color-manager.modify-profile
+  ResultAny=no
+  ResultInactive=no
+  ResultActive=yes
+If the issue persists afterwards, a reboot of the system should resolve it.
+=== Fixing the Low Battery Alert ===
+Found on Reddit; will "clean it up" later...
+cd /etc/UPower\\
+sudo nano UPower.conf\\
+If you set UsePercentageForPolicy=true then edit the percentage lines to your liking, such as:\\
+PercentageLow=50\\
+PercentageCritical=35\\
+If you prefer a time based approach, then set UsePercentageForPolicy to false and set the time notification options to your liking, such as:\\
+TimeLow=1200\\
+TimeCritical=300\\
+Hit ctrl+X to save the UPower.conf file and close out of nano editor.\\
+Reboot computer or sudo systemctl restart upower for changes to take effect.\\