Ubuntu: Why am I getting a 'port 22: Connection refused' error?

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Ubuntu: Why am I getting a "port 22: Connection refused" error?

Question: I am getting a
port 22: Connection refused
error while connecting to a server.
I have both the openssh client and server installed, and they are running. But
still there is an error. Please help.

Solutions Sample (Please watch the whole video to see all solutions, in order of how many people found them helpful):

== This solution helped 12 people ==
Try this
sudo apt-get remove openssh-client openssh-server
and then
sudo apt-get install openssh-client openssh-server
it worked for me :)
Probably not the most orthodox solution... :)

== This solution helped 29 people ==
While on the server, check to make sure sshd is actually running, and is
listening on port 22:
$ sudo netstat -anp | grep sshd
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1538/sshd
tcp6 0 0 :::22 :::* LISTEN 1538/sshd
If you don't get results, or they don't show you're listening on tcp 0.0.0.0:
22... fix that.
If you DO show that sshd is running and is listening on tcp port 22, check to
make sure there's no firewall rule getting in the way. Again, on the server:
$ sudo iptables -L | grep ssh
DROP tcp -- anywhere anywhere tcp dpt:ssh
Or alternately,
$ sudo ufw verbose
Status: active

To Action From
-- ------ ----
22 DENY Anywhere
22/tcp DENY Anywhere
If you do see a rule like one of the ones above, you'll need to fix that.
If you don't see any firewall rules in the way and you do see the service
running on the server, then it's time to check your workstation, and the
network it's connected to. Can you connect to other servers? Can you ping your
own interface or loopback address? Etc.

== This solution helped 58 people ==
I went through this issue and finally got appropriate answer.
sudo apt-get update
sudo apt-get install openssh-server
sudo ufw allow 22
Then went into raspi-config in a terminal window and enabled ssh.
This will allow port 22 to be used for sshd.