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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