Ubuntu

Technical Notes

Thu, 01/03/2008 - 21:46 — siteadmin

These notes are my personal online notebook of useful commands and "how-to's". You are welcome to make use of them if you find them helpful. They obviously don't come with any warranty! Click on one of the category tags above for the notes in any category.

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ubuntu packages can be upgraded. Run apt list --upgradable

Thu, 07/06/2023 - 15:56 — siteadmin

apt list --upgradable

Then (if desired) they can be upgraded one at a time with:

apt install --only-upgrade [packagename]

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Linux

Ubuntu

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Unsnap Firefox

Sat, 02/04/2023 - 04:35 — siteadmin

Five Steps

sudo snap remove firefox

sudo add-apt-repository ppa:mozillateam/ppa

echo '
Package: *
Pin: release o=LP-PPA-mozillateam
Pin-Priority: 1001
' | sudo tee /etc/apt/preferences.d/mozilla-firefox

echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-mozillateam:${distro_codename}";' | sudo tee /etc/apt/apt.conf.d/51unattended-upgrades-firefox

sudo apt install -y --allow-downgrades firefox
sudo dpkg-reconfigure unattended-upgrades    #And answer NO

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Linux

Ubuntu

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Preventing false mouse double-clicks under linux

Fri, 07/16/2021 - 01:30 — siteadmin

Newer versions of Kubuntu are missing the advanced mouse options which let you debounce the mouse

sudo apt install xserver-xorg-input-evdev
sudo mkdir -p /etc/X11/xorg.conf.d

Then edit /etc/X11/xorg.conf.d/xorg.conf

and append:

Section "InputClass"
    Identifier "evdev-mouse"
    MatchIsPointer "yes"
    Driver "evdev"
EndSection

You may have to reboot at this point

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Linux

Ubuntu

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Fixing a Linux broken boot

Fri, 12/11/2020 - 03:52 — siteadmin

If the system has been corrupted, and there is no grub menu, then boot from a live CD, open a terminal and do this:

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Linux

Ubuntu

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Wiping a Hard Drive Clean

Tue, 06/04/2019 - 03:05 — siteadmin

To securely wipe a hard drive of all data, do:

apt install wipe
shred -vfz -n 2 /dev/sdb

Options above are verbose, force, zero out in an extra pass
Number of passes: -n 2

An alternative “light” way of doing this is to simply copy random bytes

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Linux

Ubuntu

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iptables configuration on a linux server

Wed, 05/23/2018 - 19:44 — siteadmin

List current tables with line numbers and stats

iptables -L INPUT --line-numbers -v

Append another rule

iptables -A INPUT -s 58.245.23.126/24 -j DROP

Delete rule #3

iptables -D INPUT 3

The moment you apply IPTABLE rule it immediately becomes active.But it will not survive a reboot.
To be able to survive IPTABLES a reboot in your network configuration file /etc/network/interfaces file (referring to a Debian/Ubuntu system) you need to add:

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Linux

Ubuntu

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Setting up NFS on Ubuntu 16.04

Fri, 01/06/2017 - 22:43 — siteadmin

Make sure userid’s and groupid’s match between the systems

e.g. usermod -u 1001 -g 504 -c "Andrew Fountain" andrewf

Set up the server

set up the fully qualified domain name, e.g. server.example.org

vi /etc/hosts         # ensure it contains the line: 127.0.1.1 server.example.org
vi /etc/idmapd.conf   # ensure it contains the line: Domain = example.org (not the name of the server but the domain)
hostnamectl set-hostname server.example.org
#pre sytemed edit /etc/hostname manually, and also run hostname server.example.org

Topic:

Linux

Ubuntu