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/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse /etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted /etc/apt/sources.list.d/official-source-repositories.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted /etc/apt/sources.list.d/official-source-repositories.list:# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse /etc/apt/sources.list.d/official-source-repositories.list:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted

  /etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted
/etc/apt/sources.list.d/official-source-repositories.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted
/etc/apt/sources.list.d/official-source-repositories.list:# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
/etc/apt/sources.list.d/official-source-repositories.list:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted

find /etc/apt -type f -exec grep xenial {}+

/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted

/etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse /etc/apt/sources.list.d/official-source-repositories.list.save:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted /etc/apt/sources.list.d/official-source-repositories.list:deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-updates main restricted /etc/apt/sources.list.d/official-source-repositories.list:# deb-src http://us.archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse /etc/apt/sources.list.d/official-source-repositories.list:deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted

after adding sudo apt update to my terminal, i get the following output,with E: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease' is not signed. i know that Xenial (16.04) repositories are not necessary for 22.04, i removed it from (software and updates > other software) but error was not solved so i need your help.

while downloading ros2 packages i was Updating my apt repository cachessudo apt update, i get the following output,with E: The repository 'http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease' is not signed. i know that Xenial (16.04) repositories are not necessary for 22.04, i removed it from (software and updates > other software) but error was not solved so i need your help.