Nicotine+ Problem in Ubuntu 18.04

When I launch Nicotine Plus, I get the following message:

Gtk-Message: 21:10:30.657: Failed to load module "canberra-gtk-module"
lun 21:10 Disabled UPnP support due to errors: Failed to import miniupnpc
          module: No module named miniupnpc. Also: Failed to run upnpc binary:
          Problem while executing command ['upnpc'] (1 of 1)
lun 21:10 Note: Python Bindings for libsexy were not found. To enable spell
          checking, get them from http://www.chipx86.com/wiki/Libsexy or your
          distribution's package manager. Look for sexy-python or python-sexy.

I tried to connect to the telnet server with

telnet server.slsknet.org 2242

But I get this message:

Connected to vps.slsknet.org.
Escape character is '^]'.
Connection closed by foreign host.

What can I do?

Nicotine itself is installable by using commands below:

sudo apt-add-repository universe
sudo apt-get update
sudo apt-get install nicotine

To fix warning about canberra use commands below:

sudo apt-get install libcanberra-gtk3-module libcanberra-gtk-module

Upnpc python module came from python-miniupnpc package, to install it use

sudo apt-get install python-miniupnpc

Nicotine package depends depends on python-sexy package which is not available for Ubuntu 18.04 LTS. This dependency is very outdated, last version was available in Ubuntu 10.04 LTS. So you can ignore it without functionality loss.

Fresh idea - Nicotine web-site lists PPA with stable version. You can install fresh Nicotine from it using commands below:

sudo apt install software-properties-common
sudo add-apt-repository ppa:nicotine-team/stable
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6CEB6050A30E5769
sudo apt update
sudo apt install nicotine

You may want to check screenshots.