/usr/bin/arm-none-eabi-ar is in binutils-arm-none-eabi 2.24-2ubuntu2+4.
This file is owned by root:root, with mode 0o755.
It is a symlink to /usr/bin/./usr/lib/arm-none-eabi/bin/ar
/usr/bin/./usr/lib/arm-none-eabi/bin/ar