SSH not working after upgrade

I upgraded ubuntu to focal 20.04 and SSH was unable to negotiate with network devices I tried to ssh on.Solution was found here, or simpy editing /etc/ssh/ssh_conf by adding following lines to the end of the file: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbcMACs hmac-md5,hmac-sha1,umac-64@openssh.comKexAlgorithms diffie-hellman-group1-sha1,,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1HostKeyAlgorithms ssh-rsa,ssh-dss

Reimage/downgrade Firepower FTD 1100/2100

I had some problems while downgrading so here are my steps. Documentation is not really clear about this, so here are the steps. from fxos, reformat systemfirepower-2110# connect local-mgmtfirepower-2110(local-mgmt)# format everythingAll configuration and bootable images will be lost.Do you still want to format? (yes/no):yes enter rommon and boot via tftprommon 1 > address 2

Debian and grub2 password reset

In grub boot screen type “e” for edit, and search for line starting with linux – add “init=/bin/bash” at the end linux /boot/vmlinuz-version root=UUID=hex ro quite init=/bin/bash Press CTRL+X to boot and execute following: mount -o remount,rw / enter “passwd” to change root password (or passwd username) execute “sync” and make reboot