Old stable ElCap install has failed. URGENT HELP!

[Total_Noob]

Hello Folks. I'm wondering if an expert can look at this verbose screen image and suggest what I can do to fix this very old, and otherwise stable machine. Many Thanks.

 

[P1LGRIM]

Maybe this ?

https://mrmacintosh.com/google-chrome-keystone-is-modifying-var-symlink-on-non-sip-macs-causing-boot-issues/

 

[Total_Noob]

Thank Pilgrim (I'll blame bloody Google then!). I'm trying to run the fixes, but can't get anything booting now. And now the newer SSD I moved my files onto has failed too! Honestly, years of plane sailing and now two problems at once. Cheers though...

 

[Total_Noob]

I've tried following the instructions. Putting the code into Terminal while replacing the SSDs name.

chroot: /Volumes/HACK2OLD: Operation not permitted
Hack2:~ USERNAME$ rm -rf /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle
rm: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/_CodeSignature/CodeResources: Permission denied
rm: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/_CodeSignature: Permission denied

...lot's more permission denied entries...

rm: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Resources: Permission denied
rm: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents: Permission denied
rm: /Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle: Permission denied
Hack2:~ USERNAME$ mv var var_back # var may not exist, but this is fine
Hack2:~ USERNAME$ ln -sh private/var var
Hack2:~ USERNAME$ chflags -h restricted /var
Hack2:~ USERNAME$ chflags -h hidden /var
Hack2:~ USERNAME$ xattr -sw com.apple.rootless "" /var

(BTW I've put USERNAME in here)

So it doesn't appear to work I'm afraid. But I have got a new SSD working 90% of the way there.