hobby

1. bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.accept_ra
   net.ipv6.conf.ens224.accept_ra = 1
   bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.accept_ra_pinfo
   net.ipv6.conf.ens224.accept_ra_pinfo = 1
   bab2501@ns1:~$ sudo sysctl net.ipv6.conf.ens224.autoconf
   net.ipv6.conf.ens224.autoconf = 1
   bab2501@ns1:~$

2. bab2501@ns1:~$ sudo cat /etc/sysctl.conf | grep net.ipv6
   net.ipv6.conf.ens224.accept_ra = 1
   net.ipv6.conf.ens224.accept_ra_pinfo = 1
   net.ipv6.conf.ens224.autoconf = 1
   #net.ipv6.conf.all.forwarding=1
   #net.ipv6.conf.all.accept_redirects = 0
   #net.ipv6.conf.all.accept_source_route = 0

1. dpkg -l | awk '/^rc/ {print $2}' |xargs sudo dpkg --purge

   ¹⁾

2. sudo apt-get autoremove --purge

cp  /etc/apt/sources.list /etc/apt/sources.list.bak
    sudo sed -i -re 's/([a-z]{2}\.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list

https://www.cyberciti.biz/faq/install-lxd-on-ubuntu-20-04-lts-using-apt/