Linux Mint · The Blog of Boban Acimovic

How to install Docker and kubectl on Ubuntu 22.04 desktop

Since some time apt-key is deprecated and lot of Ubuntu 22.04 based systems throws the following warning:

Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details

You can easily fix this by properly installing Docker and Kubernetes apt archives public keys:

wget -qO - https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor | sudo dd of=/usr/share/keyrings/docker-archive-keyring.gpg

echo 'deb [ arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg ] https://download.docker.com/linux/ubuntu jammy stable' | sudo tee /etc/apt/sources.list.d/docker.list

wget -qO - https://packages.cloud.google.com/apt/doc/apt-key.gpg | gpg --dearmor | sudo dd of=/usr/share/keyrings/kubernetes-archive-keyring.gpg

echo 'deb [ arch=amd64 signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg ] http://apt.kubernetes.io/ kubernetes-xenial main' | sudo tee /etc/apt/sources.list.d/kubernetes.list

Take a look at /etc/apt/sources.list.d and find out if there is also an old source definition and if you find it, just delete it, the new one will suffice. You can also find out if there are duplicates if you run sudo apt-get update. Just delete the old version which doesn’t contain signed-by inside.

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How to fix possible missing firmware warning during kernel update on Linux Mint

If you are running default kernel with your Ubuntu or Linux Mint installation, you probably won’t face this problem during kernel updates because all packages are coming from the official distribution sources. However, if you like to run the newest Linux kernels and update them using mainline kernel installer, you may get warning possible missing firmware during the installation.

Few days ago I got this warning on my Linux Mint 20.3 Una while installing kernel 5.17.7. In most of the cases this warning won’t affect normal functionality of your Linux machine, but if you hate warnings, like I do, here is what you can do. I guess you regularly update your apt packages, but still new kernels may complain, which further means you may need even newer package. In my case I had to install linux-firmware package from Jammy Jellyfish , the newest LTS Ubuntu, Ubuntu 22.04 LTS.

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Firefox audio crackling and popping on Linux Mint

This problem was bugging me for quite a while and today I finally decided to address it. There are lot of advices online to try to run Firefox in safe mode and see if that fixes the problem, so I tried that first but it didn’t help. Safe mode actually just turns off extensions, but in my case it didn’t help.

I found out that the easiest way to reproduce the problem was to run YouTube video in one window and after that open another window with eBay. After few seconds crackling and popping always started. I run audio mainly via HDMI to my monitor, but as I have external DAC I decided to try that audio output and yes, it worked without problems. So, it seemed something was wrong with PulseAudio over HDMI.

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Add Google search engine to your Linux Mint

I had a problem recently not being able to set Google as default search engine in Firefox of my Linux Mint installation. It is not that I like Google that much, it is actually opposite, but DuckDuckGo as default search engine doesn’t give me the satisfying search so it seems it is not possible to skip Google tracking and keep your privacy, at least not at this moment.

If you had such problem, this is because Google search engine doesn’t fund Linux Mint and this is why they are not on the list. In order to turn it on, check this out .

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Add flag to Linux Mint application start command

Modern Linux desktop distributions contain really powerful settings possibilities, but it is very often difficult to find out how to configure something. You may want, for example, to add –disk-cache-dir flag to Chromium start command in order to configure cache directory, so how to do it?

right click on the menu start button and select “Configure”
click on the “Menu” button at the top of the “Menu” window
click on the “Open the menu editor” button
browse the applications and find the requested one (Chromium in this case)
select the application and click on “Properties” button on the right
add requested command flag in the “Command” field