Work around is to use the -o option and specify KexAlgorithms with the correct option.

ssh -o KexAlgorithms=+diffie-hellman-group1-sha1 admin@192.168.11.1

https://unix.stackexchange.com/questions/340844/how-to-enable-diffie-hellman-group1-sha1-key-exchange-on-debian-8-0#340853

List of errors from devices

The following are errors that are returned when trying to ssh to a device.

Cambium 450i PMP Equipment

Unable to negotiate with 192.168.0.1 port 22: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1,diffie-hellman-group14-sha1