Sometimes while making an attempt to connect a device through Bluetooth on your Linux Lite system, you can face a problem with connection:
Connection to BlueZ failed
Bluez daemon is not running, blueman-manager cannot continue. This is probably means that there were no Bluetooth adapters detected or Bluetooth daemon was not started.
If you are fan of mining cryptocurrencies and have experience with MinerGate application now you know you can install and run it while using Ubuntu live-USB (without any harm to your existing system even without installation of Ubuntu).
First, you should know, that you surely won't be able to install MinerGate application right after you booted from you live-USB Ubuntu. The reason is, that download and installation of MinerGate requires Universe repository.
Adding universte repository:
$ sudo add-apt-repository universe
Right after that you will surely need libqt5websockets (or libqt5websockets5-dev) library, because that library is not standard part of Ubuntu Live-USB. Now, when universe repository was added, you should do it without a problem:
$ sudo apt-get install libqt5websockets5-dev
(more information here: how to install libqt5websockets library in Ubuntu).
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:
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.
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
output: