We can not foresee this time but rather Altcoin becoms mainstream need to hold up longer . I think the not so distant future each one will start to find out about Altcoin , yet all news talks just about Bitcoin and never talk about Altcoins .

Aren't they already popular ?

I mean I believed there was a lot of new coins that came out became very important and there are some older coins that became huge as well. "Altcoin" is not just new obscure small coin, its all coins that are not bitcoin, hence even ethereum and binance bnb is altcoin.

Considering there are billions of dollar going through binance doors every single day it would be wise to say bnb has been used and popular among people a lot, thats 25+ billion dollars per month all exchanging hands with fee's paid in BNB instead of bitcoin.

On the other hand when we think about ethereum we already moved past the small coin levels already, anybody who knows ethereum exists already knows how big ethereum is as well. There are governments who work with ethereum blockchain projects. Hence, altcoins are not getting popular, they ARE popular if you ask me.

I think alternate coins are being popular but not as popular as bitcoin. The fact that you will only know alternate coins if you already invested on bitcoin or you worked for bounties. Same thing happens to me so I think its the same to majority of us. Only a few will take risk on crypto currency without investing on bitcoin first. Maybe we can give alts more time. 5 years will be enough to gain the same popularity as bitcoin.

I am sure that next year's altcoin will become popular, because now many people have conducted seminars to introduce cryptocurrency in several cities,
so that makes a lot of people know about cryptocurrency, then that makes people not only know about Bitcoin, but they also know about altcoin, so that makes altcoins become popular and I'm sure that the price of cryptocurrency will slowly increase.

In 3 years or after 3 years maybe altcoins is not only become popular and for sure altcoins become very high the value like a lot of the coins now who are 1 digit become hundred of dollars price each and other becone thousand dollars so it will become in the whole world for sure.

My honest opinion is that only 1% of altcoins will survive and prosper. The rest will just crash and burn and be forgotten. Ethereum is technically an altcoin and it's already popular. The more legitimate a project is, the faster it'll be discovered.

I am currently considering a continued investment in the electronic money market. This is a difficult time for the entire market. However, if I reinvest I would definitely invest in coin ONION.

also not every project has own repository with linux wallets.
Installation of the wallet and them future updates can be super easy with DeepOnion

https://deeponion.org/community/threads/official-tails-debian-and-ubuntu-install-guide.39319/

DeepOnion Forums Google Bot Activities Increased
https://deeponion.org/community/threads/deeponion-forums-google-bot-activities-increased.40829/