Merge branch '1-update-ubuntu-20-04' into 'master'

Resolve "Update Ubuntu 20.04"

Closes #1

See merge request !1

config

@@ -9,17 +9,17 @@ setupscript=./setup.sh
 packages=coreutils sed adduser libc-bin bash dash diffutils dpkg apt grep base-passwd findutils util-linux init-system-helpers gzip
 source=http://archive.ubuntu.com/ubuntu/
 keyring=ubuntu-keyring
-suite=bionic
+suite=focal
 omitdebsrc=true
 
 [Updates]
 packages=
 source=http://archive.ubuntu.com/ubuntu/
-suite=bionic-updates
+suite=focal-updates
 omitdebsrc=true
 
 [Security]
 packages=
 source=http://security.ubuntu.com/ubuntu/
-suite=bionic-security
+suite=focal-security
 omitdebsrc=true