Want to reinstall, but graphic install from ISO sees no existing system(s) 2overwrite
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I was trying to free up space (rapidly running out of it). I deleted what I guessed (bad choice) to be unneeded, including something that sounded like a Windows download helper. Anyway, I wound up unable to boot, and unable to find any effective root.
I have been a user (=not very knowledgeable).
What is fsck? Can it be done it the system refuses to recognize me as having root authority?
I can after a LOT of fouteling around, get the lynx to open a small text window (like monitor) in the upper left, showing a prompt, letting me do ls, but not sudo anything. I have no idea how to go further or get back to the GUI I am a little more familiar with.
Similarly, I may be unable to follow your backup suggestion for lack of root authority.
if you deleted stuff as ordinary user, not root, then system shouldn't need reinstall ( I think).
fsck (filesystemcheck) is a command for checking and repairing filesystems. it is useful if computer wasn't shutdown properly and filesystems haven't been unmounted 'cleanly'. I'm not sure it would help in your case, though.
that lynx was running inside Gnome/KDE terminal? I assume you managed to get it running from raid, not livecd.
I would start the system from GRUB so that it boots in text only mode. than check the directories and files, and free space (df).
read the log files in /var and look for errors.
you could do backup from livecd. afaik, every livecd gives you root authority.
I think you mix up 'root authority' with mounting.
true, sometimes only root can mount partitions. but its two different things.
here is how you specify. use gparted or similar to find physical partition name: sda1, sdb3.. or uuid (uuid is some sort of unique partition serial number, very handy, note down all uuids).
then mount it somewhere (make a temporary dir as mountpoint)
yes, root from livecd can access all partitions. it should also be able to read and write files unless you used some exotic filesystem not supported by livecd.
not sure about your other questions; check booting in GUI by trying..