EDIT: I kinda solved it by installing Wayland (with Nvidia card, Ouch!) to replace Xorg. Not sure if this is gonna last though. Perhaps Manjaro is the one I'm gonna throw out FIRST if anything happens from now on.
What should be the first line of defense? Timeshift?
This happened after I installed AUR package masterpdfeditor and 2 applications from github (some hashing algorithm programs, I think they were "Dilithium" and "Latice-based-cryptography-main", one of them was provided by NIST.)
If using GUI: I login, black screen for few seconds, then back at login screen.
If going to ctrl+alt+f2, login successful, then startx, see picture provided (higher quality).
I tried adding a new user, but result is the same.
I have a live usb to do the Timeshift. (I can also chroot if necessary... But I'm not extremely professional)
Not the original commentor, but I wanted to share my experience.
I've been daily driving Linux for over a decade now, about 6 months of that was with Manjaro. I have never had a worse experience with a distro than I did with Manjaro, period. I tried it off a recommendation, and figured my initial issues were just flukes, but I couldn't keep coming back to a broken system, so I switched distros. I've used Ubuntu, Debian, Linux Mint, Manjaro, Void Linux, Gentoo, Kali Linux, EndeavorOS, base Arch, Alpine, and my current favorite is Fedora Workstation (though I'll switch to Kinoite/Fedora Atomic KDE when Fedora 40 releases). I have never had a distro break itself like I experienced with Manjaro, and it was consistently breaking. My experience is not unique; many users have the same issues, and that is constantly echoed in this community. I had 8 years of Linux experience under my belt entering Manjaro, so experience has nothing to do with it. Plus, the issues I experienced were never the result of my actions; Manjaro broke itself. Configs I have never touched in my life were broken.
My suggestion to anyone who wants a better user experience with Arch and doesn't want to set it up themselves is EndeavorOS. That's a distro that's capable of keeping its shit together. If you want to stick your head in the sand and deny the problems everyone else has with Manjaro, I can't change your mind, and it isn't worth my time to try. Just wanted to come in and clarify that it has nothing to do with experience. That's just Manjaro, and it isn't just an Arch thing, either. I spent about 2 years with Arch-based distros and never had the issues I did with Manjaro. It's been 3 or 4 years since I last tried it, but everything I've heard has indicated that no improvement has been made in the entire system being broken occasionally department.
How is it "sticking my head in the sand" if I'm daily driving Manjaro and I'm seeing none of the problems you claim to exist?
In fact I am hard pressed to understand how you could break it. The claim it "breaks itself" is nonsense. I have completely non-tech savvy users using Manjaro without any issues.
How did yours break?
If it's a legit, common issue that can hit unsuspecting users I will STFU. But so far whenever I ask this I just get vague hand-waving. I think you understand why I'm having a hard time accepting urban myths versus my own concrete experience.
I'm going to clarify that I never used AUR while on Manjaro, as that's an important distinction that is often a cause for issues. The most notable issues I remember having were that my grub config changed after an update, and my boot entries were removed. I had to boot manually through the grub command line, then manually fix the grub config. The second was a combination of issues that likely stemmed from a single cause, but I didn't care enough to fix it because it was just the last straw. My system went from working perfectly fine one day, to being a laggy disaster the next. Programs took excessively long to open, battery drain rapidly increased, and performance was horrible. Seemed like a really bad memory leak, and rebooting didn't fix it, so I just installed base Arch which I had already prepared a flash drive for anyway. The timing couldn't have been better honestly, it was like a going away present. Other than that, I remember having driver issues multiple times, occasional crashes that (usually) went away after a reboot or update, but not much specific past that. It's been a few years, so I only remember a handful of experiences. I've never had a distro crash more often than Manjaro.
There are probably going to be bandwagoners who join in to hate on Manjaro, and most of them definitely won't have anything constructive to say, but that happens with everything. Then you have people like me who used it years ago and can only remember a handful of experiences, and some who can't remember anything useful at all, just remembering being frustrated.