Help about solving broken packages on my desktop

[Colin Law]

What does
apt policy libssl-dev
show?

Colin

On Tue, 15 Sep 2020 at 10:35, 慕冬亮 <mudongliangabcd at gmail.com> wrote:
>
> Hello guys,
>
> I am writing to kindly ask for some help about solving broken packages
> on my desktop. I have updated and upgraded the whole system.
>
> ```
> $ sudo apt update && sudo apt upgrade
> Hit:1 http://mirrors.hust.edu.cn/ubuntu focal InRelease
> Hit:2 http://mirrors.hust.edu.cn/ubuntu focal-updates InRelease
> Hit:3 http://mirrors.hust.edu.cn/ubuntu focal-backports InRelease
> Hit:4 http://mirrors.hust.edu.cn/ubuntu focal-security InRelease
> ......
> 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
> ```
> ```
> $ sudo apt-get install build-essential python3-dev libssl-dev
> inotify-tools python3-dbus
> ......
> Some packages could not be installed. This may mean that you have
> requested an impossible situation or if you are using the unstable
> distribution that some required packages have not yet been created
> or been moved out of Incoming.
> The following information may help to resolve the situation:
>
> The following packages have unmet dependencies:
>  build-essential : Depends: libc6-dev but it is not going to be installed or
>                             libc-dev
>                    Depends: gcc (>= 4:9.2) but it is not going to be installed
>                    Depends: g++ (>= 4:9.2) but it is not going to be installed
>                    Depends: dpkg-dev (>= 1.17.11) but it is not going
> to be installed
>  libssl-dev : Depends: libssl1.1 (= 1.1.1c-1ubuntu4) but
> 1.1.1f-1ubuntu2 is to be installed
>  python3-dev : Depends: python3 (= 3.7.5-1ubuntu1) but 3.8.2-0ubuntu2
> is to be installed
>                Depends: libpython3-dev (= 3.7.5-1ubuntu1) but it is
> not going to be installed
>                Depends: python3.7-dev (>= 3.7.5-1~) but it is not
> going to be installed
> E: Unable to correct problems, you have held broken packages.
> ```
> ```
> $ sudo apt install gnome-shell-extensions
> Reading package lists... Done
> Building dependency tree
> Reading state information... Done
> Some packages could not be installed. This may mean that you have
> requested an impossible situation or if you are using the unstable
> distribution that some required packages have not yet been created
> or been moved out of Incoming.
> The following information may help to resolve the situation:
>
> The following packages have unmet dependencies:
>  gnome-shell-extensions : Depends: gnome-shell (< 3.35) but
> 3.36.4-1ubuntu1~20.04.2 is to be installed
> E: Unable to correct problems, you have held broken packages.
> ```
> --
> My best regards to you.
>
>      No System Is Safe!
>      Dongliang Mu
>
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