How to tell which repositories provide which packages?

[Ralf Mardorf]

On Wed, 06 Jan 2021 05:58:41 +0100, Ralf Mardorf via ubuntu-users wrote:
>On Wed, 2021-01-06 at 05:35 +0100, Ralf Mardorf via ubuntu-users wrote:
>> I guess this does the job:
>> 
>> apt-cache policy $(awk '$1 == "Package:" { print $2 }'
>> /var/lib/apt/lists/*webupd8*amd64_Packages) | grep -E Installed:\
>> [[:digit:]] -B1
>> 
>> Replace "*webupd8*amd64" by the wanted PPA.  
>
>I don't know the policy for package versioning. Perhaps it's better to
>replace "[:digit:]" by "[:alnum:]", juts in case it should be allowed
>to start with a letter. The main point is to get rid of packages
>"Installed: (none)". It's probably not allowed to start the versioning
>with a char that is neither a number, nor a letter.
>
>[weremouse at moonstudio ~]$ apt-cache policy $(awk '$1 == "Package:" {
>print $2 }' /var/lib/apt/lists/*webupd8*amd64_Packages) | grep -E
>Installed:\ [[:alnum:]] -B1

Probably that's perfect:

apt-cache policy $(awk '$1 == "Package:" { print $2 }' /var/lib/apt/lists/*webupd8*amd64_Packages) | grep -v "Installed: (none)" | grep "Installed: " -B1