Notifications don’t come

Yesterday I installed Ubuntu 19.04, but all notifications don’t come. My notification list is empty always. On Manjaro with same version of Gnome notifications worked. I tried Thunderbird*, Evolution, Mailspring. *in Thunderbird notifications appear on the desktop. Even when I install any app, in my notifications list don’t be shown message about transaction is over. I’ve thought the issue is in gnome extensions. But disabling it didn’t help. Any ideas?

[ Politics ] Open Question : Was Trump wrong for telling Congress Lawmakers to “go back to where they come from” or no?

Trump on Sunday morning targeted “progressive Democratic congresswomen,” — most likely referring to the “Squad” of freshman progressives which include New York Rep. Alexandria Ocasio-Cortez, Massachusetts Rep. Ayanna Pressley, Michigan Rep. Rashida Tlaib, and Minnesota Rep. Ilhan Omar — and told them to “go back” to their “corrupt” and “broken and crime infested” countries.

Unity launch bar and menu bar won’t come up on Ubuntu 16.04

I have an old 32-bit netbook and have been running Ubuntu since 2012. I currently run Ubuntu 16.04 LTR and have run update manager consistently. When I logged in today, my wallpaper came up but without the launch bar and without the top menu bar. I have tried everything I know of, including some of the older suggestions on this site. Despite being a long-time Ubuntu user, I am not code-savvy. I use the Unity interface for everything. Can you help?

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How come keys can stay secure through factorization of primes

Sooo I under n=pq where p and q are both large primes so it making factorizing them inefficient to the point of impossible but there must a a list of prime sets (heard people call them trap doors I think?) That are well know? Like if p and q are both know pairs wouldn’t you be able look at n and go well I know this already so I don’t need to even work it out I already can tell you it’s pq. Or are there an infinite number of primes available and Is it only limited by the how large the key is? Isn’t there a finite ammount of primes available in 2048 bits that it wouldn’t be that hard? Clearly it’s time consuming enough that it hasn’t been cracked but I don’t get why not since you know how many primes there are and also what they all are.