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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]
Topic: 
Linux
Ubuntu

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
Topic: 
Linux
Ubuntu

Repairing grub boot in EFI system running Ubuntu

Fri, 07/15/2022 - 23:43 — siteadmin

sudo fdisk -l
#now identify EFI and linux partitions and set them here
#e.g.:
EFI=/dev/nvme0n1p1
LIN=/dev/nvme0n1p6

sudo apt -y install grub-efi
sudo mkdir /media/root && sudo mount $LIN /media/root
sudo mkdir /media/efi && sudo mount $EFI /media/efi
sudo grub-install --target=x86_64-efi $EFI --efi-directory=/media/efi --boot-directory=/media/root/boot

Topic: 
Linux

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

Topic: 
Linux
Ubuntu

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:

Topic: 
Linux
Ubuntu

Compress a folder into a single file for backup

Thu, 01/16/2020 - 02:23 — Andrew

tar -cvjSf filename.tar.bz2 foldername
-c create
-v verboase
-j bzip2
-S Sparse files handled efficiently
-f filename

Topic: 
backup
Linux

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

Topic: 
Linux
Ubuntu

Recover disk drive using ddrescue

Tue, 12/11/2018 - 15:50 — siteadmin

See user manual here: www.gnu.org/…escue_manual.html

Topic: 
backup
Linux

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:
Topic: 
Linux
Ubuntu

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