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Re: want pinning with examples to prevent unwanted package(s) from being installed

On 31-08-17, Felix Miata wrote:
> Over an hour I've been searching in vain, apparently using broken Google-fu, for
> something using examples to explain how to prevent unwanted package(s) from
> being installed via pinning when apt-mark's hold is being disregarded. Anyone
> familiar with an URL that would do this?
> In openSUSE, it's a simple process:
> 	zypper al unwantedpackagename[version]
> That's all there is to it, other than it also works with wildcards.
> -- 
> "The wise are known for their understanding, and pleasant
> words are persuasive." Proverbs 16:21 (New Living Translation)
>  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
> Felix Miata  ***  http://fm.no-ip.com/

Not sure that I understand, because man page gives enough examples.

 P < 0
      prevents the version from being installed

So, for preventing some package to be installed:

Package: somepackage
Pin: origin ""
Pin-Priority: -1

That will prevent all packages with somepackage name to be installed, no
matter of origin. In Pin section, you can use release instead, if you
want to restrict just specific release, but that is all well explained
in man page of apt_preferences with lots of examples.