Despite it being one of the most popular and feature rich download managers out there and it being foss, it seems that most repos don't have it ( except for flahub iirc) Is there is any reason behind that?
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
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i don't think so there are far more less mainstream and ancient programs in the repos
the AUR is "Arch User Repository" witch is community maintained repo ..so i don't think that counts.
In the end everything is maintained by the community, the only difference is that AUR is "everyone can maintain" and official is "we have team of official maintainers that decided to maintain these packages". Personally I can't imagine running without using AUR
But it's fair if it doesn't count for you