According to build log, apt-esm-hook seems to be in fact apt-hook/hook.cc at src package level:
install -D -m 755 hook /<<PKGBUILDDIR>>/debian/ubuntu-advantage-tools/usr/lib/ubuntu-advantage/apt-esm-hook
According to build log, apt-esm-hook seems to be in fact apt-hook/hook.cc at src package level:
install -D -m 755 hook /<<PKGBUILDDIR> >/debian/ ubuntu- advantage- tools/usr/ lib/ubuntu- advantage/ apt-esm- hook