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Ubuntu error: unable to locate package libqt5websockets5-dev : Solution

In case you're running Ubuntu USB live distro and trying to install  libqt5websockets5 or libqt5websockets5-dev package and your Ubuntu system cannont find it:

$ sudo apt install libqt5websockets
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libqt5websockets

In case you are going to install libqt5websockets5 package, system will fail to do it and will show you following error in terminal:

$ sudo apt install libqt5websockets5
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libqt5websockets5 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source

E: Package 'libqt5websockets5' has no installation candidate

it surely means that you are missing official Ubuntu repositories.


Solution is very simple and easy: add (activate) needed repository:

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Written by Administrator on Tuesday May 12, 2020

How to install Signal Desktop messenger on Linux Lite?

Signal is very popular messenger and mostly is used like mobile phone application on mobile phones, but you can install it on your Linux desktop as well. I will show, how in install Signal desktop application on Linux Lite, which is Ubuntu-based distro and it means it uses the same repositories like Ubuntu linux.

Following Signal installation manual will work on every Debian-based linux distro.

Install Signal on Linux Lite desktop

All you need to to is to run following commands in your terminal

curl -s https://updates.signal.org/desktop/apt/keys.asc | sudo apt-key add
echo "deb [arch=amd64] https://updates.signal.org/desktop/apt xenial main" | sudo tee -a /etc/apt/sources.list.d/signal-xenial.list
sudo apt update && sudo apt install signal-desktop


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Written by Administrator on Tuesday May 12, 2020

Atom installation on openSUSE Linux: Signature verification failed error resolution

Atom is a very popular "hackable text editor for the 21st Century" not only for linux, but owners of openSUSE Linux can have problems with unsigned package while installing an .rpm package:

Error: INVALID:atom-1.46.0-0.1.x86_64(file-eca764a8): Signature verification failed [6-File is unsigned]

If you still want to install it on your openSUSE system, there's a problem resolution:

  1. Go to /etc/zypp
  2. Open file zypp.conf (as a root) and find a line # pkg_gpgcheck = unset -> according to gpgcheck.Leave this line without change :D
  3. Add following line above: pkg_gpgcheck = off
  4. Save file and exit.
  5. Install Atom .rpm package one more time. It will go without a problem.

Following this operation will switch off package signature verification and you will be able to install Atom.

Important notice

Problem with unsigned package was added to issues on official Atom github repository several years ago, but developers still didn't resolve it. Please, take this information with understanding, that Atom is being developed by a group of people, who have programmed very popular and really great text editor for several programming languages and platforms totally free.

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Written by Administrator on Monday May 11, 2020

How to install GNU GCC compiler (C++) in Devuan linux?

In case you are planning to install GNU gcc compiler, you will surely need other tools (make app, man pages, etc), that's why it's reasonable to install those additional tools first:

$ sudo apt-get install build-essentail

and then:

$ sudo apt-get install g++-multilib g++-6-multilib gcc-6-doc libstdc++6-6-dbg

(those libraries require approximately 119 MB of free disk space in your system)

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Written by Administrator on Saturday May 9, 2020

How to remove (uninstall) Moria game in Devuan Linux?

In case you're not the biggest fan of Moria game, you can easily get rig of it in your Devuan Linux installatio by running a following command in terminal:

$ sudo apt purge moria


Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
0 upgraded, 0 newly installed, 1 to remove and 26 not upgraded.
After this operation, 626 kB disk space will be freed.
Do you want to continue? [Y/n] Y
(Reading database ... 110562 files and directories currently installed.)
Removing moria (5.6.debian.1-2+b2) ...
Processing triggers for mime-support (3.60) ...
Processing triggers for desktop-file-utils (0.23-1) ...
Processing triggers for man-db ( ...
Processing triggers for hicolor-icon-theme (0.15-1) ...
(Reading database ... 110528 files and directories currently installed.)
Purging configuration files for moria (5.6.debian.1-2+b2) ...

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Written by Administrator on Friday May 8, 2020