Hello guys, I have been looking for a solution and made this, I hope you could use it.
sudo nano /etc/apt/sources.list
change all lines with:
deb http://old-releases.ubuntu.com/ubuntu/ eoan main restricted universe multiverse
#deb-src http://old-releases.ubuntu.com/ubuntu/ eoan main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu/ eoan-security main restricted universe multiverse
#deb-src http://old-releases.ubuntu.com/ubuntu/ eoan-security main restricted universe multiv>
deb http://old-releases.ubuntu.com/ubuntu/ eoan-updates main restricted universe multiverse
#deb-src http://old-releases.ubuntu.com/ubuntu/ eoan-updates main restricted universe multive>
deb http://old-releases.ubuntu.com/ubuntu/ eoan-backports main restricted universe multiverse
#deb-src http://old-releases.ubuntu.com/ubuntu/ eoan-backports main restricted universe multi>
and finilly could update
sudo apt-get update
