Finally I got the script to list all installed ppa

find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
    while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/ 
{print "sudo ppa-purge ppa:"$4"/"$5}' "$file"; done

and also to remove them

find /etc/apt/sources.list.d -type f -name "*.list" -print0 | \
    while read -d $'\0' file; do awk -F/ '/deb / && /ppa\.launchpad\.net/ 
{system("sudo ppa-purge ppa:"$4"/"$5)}' "$file"; done 

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1769576

Title:
  not able to upgrade from ubuntu 16.04 to 18

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