I'm getting "Error: Unknown package has no name defined" when updating a site from 220.127.116.11 to 18.104.22.168 I had read a reinstall of composer had fixed this for someone else, but hasn't for me. This also happens on the same site (running locally) from a Windows and Mac OS machine - on the Mac I have been able to install some Craft updates, but I get the same error when updating plugins.
Plugins installed are: CKEditor, Contact Form, Redirect Manager, Twitter, Contact Form Extensions, Contact Form Honeypot.
I'm not able to remove any of the plugins via admin to see if they are breaking the update.
I've tried deleting the /vendor file and reinstalling the plugins with composer install - they all install fine without errors.