Problem was solved by installing pepperflashplugin-nonfree package using Synaptic package manager!
Package: pepperflashplugin-nonfree
Priority: optional
Section: multiverse/web
Installed-Size: 65
Maintainer: Ubuntu Developers ubuntu-devel-discuss@lists.ubuntu.com
Original-Maintainer: Bart Martens bartm@debian.org
Architecture: amd64
Version: 1.3ubuntu1
Depends: debconf | debconf-2.0, wget, gnupg, libatk1.0-0, libcairo2, libfontconfig1, libfreetype6, libgcc1, libglib2.0-0, libgtk2.0-0 (>= 2.14), libnspr4, libnss3, libpango-1.0-0 | libpango1.0-0, libstdc++6, libx11-6, libxext6, libxt6, libcurl3-gnutls, binutils
Suggests: chromium, ttf-mscorefonts-installer, ttf-dejavu, ttf-xfree86-nonfree, hal
Conflicts: libflash-mozplugin
Filename: pool/multiverse/p/pepperflashplugin-nonfree/pepperflashplugin-nonfree_1.3ubuntu1_amd64.deb
Size: 10052
MD5sum: 99172937c43768b153fedcbb7cf36e26
SHA1: 60313ff75a9feb3adc02bcd2c5b5cac35ac824c3
SHA256: d9ccee6607dad3d7b1748ba0b1a9a1d5b71896eaa313d153796c1f708c07b923
Description-ru: Pepper Flash Player — модуль для браузера
Этот пакет скачивает Chrome с ресурсов Google и распаковывает его, чтобы
сделать Pepper Flash Player доступным в Chromium. Лицензионное соглашение
доступно на сайте Google.
Description-md5: 308421c13180fc4cf682be0755dca66d
Homepage: http://wiki.debian.org/PepperFlashPlayer
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
http://i.imgur.com/u7b3RiV.png
http://i.imgur.com/lZErST0.png
https://wiki.debian.org/PepperFlashPlayer
https://packages.qa.debian.org/p/pepperflashplugin-nonfree.html