I just updated Node-RED to version 2.0.5 (on Ubuntu) without any problems. Starting by hand shows that version 2.0.5 is running (see below)
What surprises me is that I still get version 1.3.4 displayed in the top right menu.
Likewise, in the palette for the "Node node-red" I get version 1.3.4 displayed. There is no update button.
Did I forget something during the update?
20 Aug 16:48:44 - [info] Node-RED version: v2.0.5
20 Aug 16:48:44 - [info] Node.js version: v14.15.4
20 Aug 16:48:44 - [info] Linux 5.4.0-80-generic x64 LE
20 Aug 16:48:44 - [info] Loading palette nodes
20 Aug 16:48:44 - [info] node-red-contrib-ccu version: 3.4.0
OK, it is solved, but I don't know why
Background: Some weeks ago I updated to an older 2.0.x version (from 1.3.4) an just checked, that everything is working.
After this I had several reboots
Now I updated to 2.0.5 (from 2.0.x) an noticed that the menue shows 1.3.4.
After a reboot (and again a browser refresh) it shows now 2.0.5
Are you sure the old version was not still running? You only showed the start of the node red startup. Perhaps it failed showing the port already in use.