Trying to SSH to a Cisco switch from Ubuntu 20.04 you may get this error. I’ve noticed the same thing from Redhat RHEL 8:
This error is because Ubuntu 20.04 has disabled the SHA1-based key exchange methods after some attacks have been found on SHA1.
To work around this issue for Cisco switches you can use the command line argument -oKexAlgorithms=+diffie-hellman-group1-sha1 like this:
Ubuntu 20.04 Cisco Anyconnect
There seems to be a problem on 16.04 with Cisco VPN when installing only network-manager-vpnc. Option for Cisco VPN simply doesn't show in the list. Another solution is to install. Sudo apt-get install openconnect network-manager-openconnect-gnome then. Connecting to VPN Server with Cisco AnyConnect from Linux Terminal. Install Minecraft Server on Ubuntu 20.04. How to check WiFi signal strength in.
How To Install Cisco Anyconnect Ubuntu
Building LXC Containers on Ubuntu 20.04 Focal Fossa with the Older (-t template) Method. Cisco AnyConnect VPN CentOS 7. Cisco AnyConnect VPN Ubuntu 16.04. This procedure is for configuring Cisco Anyconnect VPN on CentOS7 gnome desktop. If you’re running Ubuntu 16.04 LTS (Xenial Xerus) or later, including Ubuntu 18.04 LTS (Bionic Beaver) and Ubuntu 20.04 LTS (Focal Fossa), you don’t need to do anything. Snap is already installed and ready to go.
To save this for the specific IP permanently, add to your ssh_config file:
Cisco Anyconnect Download
This will set that option permenantly for the specific host.