Re: ELPA

[Stefan Monnier]

> *Backtrace*
>
>   Debugger entered--Lisp error: (wrong-type-argument package-desc nil)
>   signal(wrong-type-argument (package-desc nil))
>   package-menu--mark-upgrades-1()
>   package-menu-mark-upgrades()
>   funcall-interactively(package-menu-mark-upgrades)
>   call-interactively(package-menu-mark-upgrades nil nil)
>   command-execute(package-menu-mark-upgrades)

Hmm.. from which buffer did you run `package-menu-mark-upgrades`?

If you put point in the like that says

    signal(wrong-type-argument (package-desc nil))

in the backtrace buffer and then do:

   e (point) RET

that should give you the position in the *Packages* buffer where it
found line that for some reason doesn't have the expected
`tabulated-list-id` text-property, so you might want to move to that
position in the buffer and look at that line, maybe select it to get
more info about that package.


        Stefan