Google Chrome error: Error initializing NSS without a persistent database

It was working properly before, suddenly it stopped working. When I tried to open by clicking on its icon, but nothing happens.

As already here are many questions related to this, but none of them are working for me. I already checked this and this.

I uninstalled Chrome by following the instructions from How do I completely uninstall Google Chrome and Chromium?.

sudo apt-get purge google-chrome-stable
rm ~/.config/google-chrome/ -rf

Again I installed Chrome by:

sudo apt-get install google-chrome-stable

But the problem is still thesame.

When I enter google-chrome in terminal I get following error.

[12289:12323:0723/014456:ERROR:nss_util.cc(744)] Error initializing NSS with a persistent database (sql:/home/maddy/.pki/nssdb): libsoftokn3.so: cannot open shared object file: No such file or directory
[12289:12323:0723/014456:ERROR:nss_util.cc(212)] Error initializing NSS without a persistent database: NSS error code: -5925
[12289:12323:0723/014456:FATAL:nss_util.cc(214)] nss_error=-5925, os_error=0

Workaround (symlink the nss libraries into /usr/lib/nss):

sudo ln -st /usr/lib "$(uname -i)-linux-gnu/nss"

Source: Chromium Issue Tracker (with adaptations)