Please, anyone who can help with a hopefully simple brain surgery! I have a multi-boot system I've used daily and in its present form for probably 2 years. Every day I use my updated PCLOS GNOME and I don't shut it down often but do frequently put it to sleep. Thunderbird had been crashing frequently recently so a couple nights ago I closed T-Bird and Firefox and shutdown the machine for a fresh boot in the morning. With several attempts it just gets to the line "waiting for sda8 to appear" and after a minute timeout period I get a kernel panic.
Grub appears normal (visually at bootup) and I can boot into XP or this older PCLOS GNOME I've kept for emergencies (like now). In Nautilus the root partition I need is not showing and neither is its /home partition. Gparted shows all partitions correctly but the root partition I need shows no mount point and no key symbol. I tried running Partition>Check to check and repair /dev/sda8 and it didn't help. My partitions are
/dev/sda1 NTFS XP
/dev/sda2 FAT32 Storage (files for Tbird and FF live here so they are the same in every OS.
/dev/sda5 ext4 / (the one I'm using right now)
/dev/sda7 ext4 /home
/dev/sda8 ext4 (supposed to be root of my missing OS)
/dev/sda9 ext4 /home
I searched some and I'm reading at http://www.av8n.com/computer/htm/grub-reinstall.htm
I don't quite grok what radicula is and I would prefer specific advice for our beloved OS. I can ignore "sudo" but I'm still not on familiar ground even if the answer is in front of my face.