I've tried to install colour themes that can be found on MELPA, but when I use "M-x install-package", they are not found.
I restart emacs after each modification of the init.el file, and refresh the list of packages before each try.
Here is my init.el file :
(require 'package)
(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/") t)
(package-initialize)
(require 'ggtags)
(add-hook 'c-mode-common-hook
(lambda ()
(when (derived-mode-p 'c-mode 'c++-mode 'java-mode 'asm-mode)
(ggtags-mode 1))))
(define-key ggtags-mode-map (kbd "C-c g s") 'ggtags-find-other-symbol)
(define-key ggtags-mode-map (kbd "C-c g h") 'ggtags-view-tag-history)
(define-key ggtags-mode-map (kbd "C-c g r") 'ggtags-find-reference)
(define-key ggtags-mode-map (kbd "C-c g f") 'ggtags-find-file)
(define-key ggtags-mode-map (kbd "C-c g c") 'ggtags-create-tags)
(define-key ggtags-mode-map (kbd "C-c g u") 'ggtags-update-tags)
(define-key ggtags-mode-map (kbd "M-,") 'pop-tag-mark)
I've installed ggtags and ahundry, but not zenburn or solarized-theme for example.
So can someone please tell me what could be wrong, because I have no idea.