You can still use https://launchpad.net/~ubuntu-mozilla-security/+archive/ppa/+sourcepub/2395551/+listing-archive-extra in that case or rebuild xul-ext-lightning-locales 1.3 from the source package.
You can still use https:/ /launchpad. net/~ubuntu- mozilla- security/ +archive/ ppa/+sourcepub/ 2395551/ +listing- archive- extra in that case or rebuild xul-ext- lightning- locales 1.3 from the source package.