The well-known ufw firewall GUI is not available by default on devuan 5, so we will download the package from the Devuan Package View site:

wget http://deb.devuan.org/merged/pool/DEBIAN/main/g/gui-ufw/gufw_20.04.1-4_all.deb

To install the package:

sudo gdebi gufw_20.04.1-4_all.deb

And here is the firewall with a graphical interface.

When installing virtualbox via .deb file retrieved from the site, an error appeared because a dependency was not satisfactory for the installation. (libvpx6)

For this we will download the missing dependency and install it using the devuan Package View site:

wget http://deb.devuan.org/merged/pool/DEBIAN/main/libv/libvpx/libvpx6_1.9.0-1_amd64.deb

Once downloaded, just open an terminal window:

sudo gdebi libvpx6_1.9.0-1_amd64.deb

After installing the missing dependency you can continue installing virtualbox.

First step install Linux Headers and compilation dependencies:

sudo apt install linux-headers-$(uname -r) build-essential libglvnd-dev pkg-config dkms -y

Second step blacklist the nouveau driver, create a blacklist file:

sudo nano /etc/modprobe.d/blacklist-nouveau.conf

In the file add the following and save the file:

blacklist nouveau
options nouveau modeset=0

Then regenerate the kernel initramfs:

sudo update-initramfs -u

Third step install the latests NvidiaGraphicsDrivers:

sudo apt install firmware-misc-nonfree nvidia-kernel-dkms nvidia-driver nvidia-cuda-toolkit nvidia-cuda-dev nvidia-settings nvidia-smi nvidia-xconfig nvidia-opencl-icd nvidia-opencl-common nvidia-detect -y

Reboot.

To view how version you have installed, just open an terminal and enter follow:

nvidia-smi

Source

[Edit] After updating the repos there was a dependency error with the nvidia-settings package in the backports sources, to fix this incident it was enough to remove the backports source command.

It may happen that the persistenced daemon does not activate and need i386 binaries to work, it will then have to be done manually with the commands below:

sudo dpkg --add-architecture i386

sudo apt update

sudo update-rc.d nvidia-persistenced defaults

sudo service nvidia-persistenced start

Source

Enjoy!

FFmpeg is a collection of open source software intended for processing audio or video streams. Source

Be sure that you have the last version of ffmpeg:

ffmpeg -version

You will see an output of your version, in my case i have the last stable version 4.1.6.

No output??? Whaaaat!!! Don't panic on the Titanic, we need just to install the package:

sudo apt update && sudo apt upgrade -y
sudo apt install ffmpeg -y

Go to the Videos folder and we create an file like this, necessary to concat later:

file '/path_to_my_file/part1.mp4'
file '//path_to_my_file/part2.mp4'
file '/=/path_to_my_file/part3.mp4'

then save the file with a name of your choice in .txt output, in my example merge.txt.

Now we can merge our vids, the per-file main options retained are:

-f input/output with the concat option
-i input file or url
-c codec or stream output with the copy option

 ffmpeg -f concat -safe 0 -i merge.txt -c copy my_vids.mp4

After a few moments you can see your new merged video.

Enjoy!

Source

How to upgrade the kernel to the latest via backports sources.

You need to add extra backports sources tou your sources list:

echo "deb http://deb.devuan.org/merged <my_dist>-backports main contrib non-free" >> /etc/apt/sources.list

according to your OS change <my_dist> with ascii or beowulf

apt update

To know how kernel are installed:

uname -a

To search a newest kernel:

apt search linux-image

In the output we will see a lot of kernels, but we have interest to the latest, at this time the kernel 5.7:

Lets do it and install the latest kernel:

apt install linux-image-5.7.0-0.bpo.2-amd64 linux-headers-5.7.0-0.bpo.2-amd64 -t buster-backports -y

A reboot is needed to boot on the new kernel:

reboot

We can check now:

uname -a

The output:

Linux my-pc 5.7.0-0.bpo.2-amd64 #1 SMP Debian 5.7.10-1~bpo10+1 (2020-07-30) x86_64 GNU/Linux

let's take it a step further by removing the old kernels, in general it is advisable to keep 2 kernels in case there is a problem with one of them.

To view the installed kernel:

dpkg --list 'linux-image*'

In the output you will see how kernel you can purge, in my case i keep the 4.19 and the 5.7 and purge the 5.6.

Example to purge a kernel:

apt autoremove --purge linux-image-5.6.0-0.bpo.2-amd64 linux-headers-5.6.0-0.bpo.2-amd64 -y

We need to upgrade the grub with the changes we made:

update-grub2

After an reboot in the boot menu, select advanced options, you can also check the kernels who are usable.

In case if you have a graphic card using open firmwares you'll need to update your kernel with it, just check this tutorial

hello to you users of the freedom linux!

After installing Cinnamon as an office environment you risk having a hiccup with the network manager who indicates that the Wired on / off switch is unmanaged.

Nothing simpler, it happens by commenting on arguments in the conf interfaces file.

We open a terminal window as root then insert the lines below:

nano /etc/network/interfaces

Then comment on these 2 lines as follows:

#allow-hotplug ****
#iface **** inet dhcp

Adapt the asterisks according to the name of your network interface, if you do not know the name of this one:

ip link show

Choice 2 will tell you

And finally restart the service:

/etc/init.d/network-manager restart

And here is the incident resolved