I am using XChat as an IRC client. I am trying to get the OSM channel from here, but when I look for #OSM in the channel list I cannot find it.
I am connected to Ubuntu servers. Do I need to connect to the IRC server listed on this page in order to find the channel?
I am connected to Ubuntu servers.
The Ubuntu channels are on the Freenode network. The OpenStreetMap project also has a channel on Freenode as #openstreetmap instead of #osm.
Do I need to connect to the IRC server listed on this page in order to find the channel?
Yes. In order to connect to an IRC channel, you must be connected to the same network. So to join the official OpenStreetMap IRC channel, you will need to connect to irc.oftc.net and then /join #osm.