Category: Linux

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SSH Fails to Connect

Symptom

sign_and_send_pubkey: signing failed for RSA

Solution, make sure your ~/.ssh/id_rsa has the proper permissions, it should be read/write for the owner and none for anyone else.

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MD5SUM – Checksum on Linux

Use the following command to get a checksum

md5sum html/path/file.php

Create a file of checksums for future verification, here's just one file create a batch job to create lots of files instead.

md5sum html/path/file.php > md5sum_input.txt

Now check the md5 keys again, using md5sum_input.txt

md5sum -c md5sum_input.txt
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Install SQLite Browser

It looks like my SQLite Browser Got Updated to Snap, and it was using the development branch and NOT the stable branch. Here are some of the snap tricks you can use to see what's installed, what's available and to fix things.

See what you are using
$ which sqlitebrowser

See what snap versions you have local
$ snap list sqlitebrowser --all

See what versions are available
$snap info sqlitebrowser

Revert a local version
$ sudo snap revert sqlitebrowser --revision 2851

Uninstall and Install Stable Version
$ sudo snap remove sqlitebrowser
$ sudo snap install sqlitebrowser --channel=latest/stable

Has a nice Query Builder

$ sudo apt-get update
$ sudo apt-get install sqliteman

SQLiteStudio
Refer: https://sqlitestudio.pl

SQLiteBrowser
Refer: https://linuxhint.com/install-sqlite-browser-ubuntu/

Install
$ sudo add-apt-repository ppa:linuxgndu/sqlitebrowser-testing
$ sudo apt-get update && sudo apt-get install sqlitebrowser

Remove
$ sudo apt-get remove sqlitebrowser

 

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Install Microsoft Fonts with Play on Linux

Refer: https://gist.github.com/ibrahimtuzlak0295/2a66981f99f25e08cb2039df53391b05

The Play on Linux Way

Normally the Microsoft Core Fonts can be installed like this:

  • Click Configure
  • Select the prefix where you want the fonts installed
  • Tab Install components
  • Select Microsoft Core Fonts from the list and click Install

Manually

However, if for some reason this doesn't install the fonts, it's still possible to do that manually. First install the ttf-mscorefonts-installer package:

sudo apt install ttf-mscorefonts-installer

Note the prefix name: ls ~/.PlayOnLinux/wineprefix

And replace yourprefix in the command with the one you want:

cp /usr/share/fonts/truetype/msttcorefonts/* ~/.PlayOnLinux/wineprefix/yourprefix/drive_c/windows/Fonts

Now we have the core fonts in place. We can remove the package:

sudo apt purge ttf-mscorefonts-installer
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Install Local Kubernetes on Ubuntu 20.04

Kubernetes - K8s

Installation

Install Docker Ubuntu

Refer: https://linuxconfig.org/how-to-install-docker-on-ubuntu-20-04-lts-focal-fossa

Use the apt command to install the docker.io package

sudo apt install docker.io

Start docker and enable it to start after the system reboot

sudo systemctl enable --now docker

Optionally give any user administrative privileges to docker

sudo usermod -aG docker SOMEUSERNAME

Reboot Computer to Verify

reboot

Check docker version

docker --version

Verify Installation

docker run hello-world

Install Single node with MicroKs

Refer: https://ubuntu.com/kubernetes/install#single-node

Install latest MicroK8s

sudo snap install microk8s --classic

Optionally give any user administrative privileges to microk8s

sudo usermod -a -G microk8s mruckman
sudo chown -f -R mruckman ~/.kube

After installing MicroK8s, you should verify it is ready. Use this command, after another reboot:

microk8s.status

To block until MicroK8s is ready, use the following command:

microk8s.status --wait-ready

Accessing Kubernetes: MicroK8s embeds a kubectl and a .kubeconfig file required for accessing the installed MicroK8s. This avoids colliding with any local versions that might be already installed. Here is an example of how to use this:

microk8s.kubectl
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Upgrade to Ubuntu 20.04

There are issues using a GUI to upgrade, sometimes you cannot get to an acceptance button or the like. It's better to just upgrade from the terminal itself.

Refer: https://ubuntu.com/blog/how-to-upgrade-from-ubuntu-18-04-lts-to-20-04-lts-today

Use the following to see if an upgrade is available

sudo do-release-upgrade -c

Perform the actual upgrade

sudo do-release-upgrade

DVD Playback with Ubuntu 21.04
Refer: https://linuxconfig.org/unable-to-play-the-file-missing-decoder-on-ubuntu-20-04-lts-focal-fossa

PLEASE NOTE: VLC is still a better player option

sudo apt install -y ubuntu-restricted-extras
sudo apt install -y libdvdnav4 libdvd-pkg gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly

Desktop Icons No Longer work with Nautilus

Refer: https://markperez.dev/blog/organize-desktop-icons-ubuntu/

You will need to make Nemo your default desktop controller

Disable Nautilus desktop

gsettings set org.gnome.desktop.background show-desktop-icons false

Install the software and remove gnome extension

sudo apt install nemo dconf-editor ; sudo apt remove gnome-shell-extension-desktop-icons

Autostart the nemo desktop icons, but this needs added as startup action:

nemo-desktop

Then in UI GUI "Startup Applications", add

Name: nemo-desktop
Command: nemo-desktop
Comment: Get icons working on Desktop

Reboot, to complete Desktop setup

Charles did NOT upgrade

Remove it

sudo apt-get remove charles-proxy

Refer: https://www.charlesproxy.com/latest-release/download.do

Extract the download, and launch

/home/mruckman/Downloads/charles/bin/charles

The following DOES NOT Work!

wget -q -O - https://www.charlesproxy.com/packages/apt/PublicKey | sudo apt-key add -
sudo apt-get update
sudo apt-get install charles-proxy

Stacer needed re-installed, use software center

Update How Visual Studio Code Works

Remove all parts of "Visual Studio Code"

sudo apt purge code
sudo apt autoremove

Delete launchers

/usr/share/applications
~/.local/share/applications

Visual Studio Code is going to have problems, ended up removing references to it from menu editor.

Refer: https://github.com/microsoft/vscode/issues/41037

sudo apt-get install code

You need to delete this file and create a new one with menu editor.

/home/mruckman/.local/share/applications

[Desktop Entry]
Version=1.1
Type=Application
Name=Visual Studio Code
Comment=Editor
Icon=com.visualstudio.code
Exec=/usr/share/code/code --no-sandbox --unity-launch %F
Actions=
Categories=Development;

You can use this file instead of creating it:

menulibre-visual-studio-code.desktop

Fonts Need Updated

ttf-fscorefonts

Refer for Patch: https://www.leowkahman.com/2018/01/02/workaround-to-failure-to-download-extra-files-ttf-mscorefonts-installer/

Go here: https://sourceforge.net/projects/corefonts/files/the%20fonts/final/

Delete flash plug-in if it exists

sudo su -
cd /var/lib/update-notifier/package-data-downloads/partial
dpkg-reconfigure ttf-mscorefonts-installer
fc-cache -vr

Refer: http://people.uleth.ca/~daniel.odonnell/Blog/fixing-failure-to-download-extra-fonts-error-in-ubuntu-1910
Refer: https://ranatauqeer.blogspot.com/2019/03/failure-to-download-extra-data-files.html

ttf-mscorefonts-installer_3.7_all-deb

Use the above file or download them fresh again

sudo apt-get install ubuntu-restricted-extras
wget http://ftp.de.debian.org/debian/pool/contrib/m/msttcorefonts/ttf-mscorefonts-installer_3.7_all.deb
sudo apt purge ttf-mscorefonts-installer -y
sudo dpkg -i ttf-mscorefonts-installer_3.7_all.deb