title: solve Depends for install python3-matplotlib
body: <p>I am trying to install <strong>python3-matplotlib</strong>  by this command:</p>
  <p><code>sudo apt install  python3-matplotlib</code></p>
  <p>but terminal return me this error:</p>
  <pre><code>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:
   python3-matplotlib : Depends: python3 (&lt; 3.8) but 3.8.2-3 is to be installed
                        Depends: python3-kiwisolver but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>
  <p>I tried to solve it by:</p>
  <pre><code>apt-get update
  apt-get upgrade
  sudo aptitude install python3-matplotlib 
  </code></pre>
  <p>but return:</p>
  <pre><code>The following NEW packages will be installed:
    fonts-lyx{a} libjs-jquery-ui{a} python-matplotlib-data{a} python3-cycler{a} python3-dateutil{a} python3-matplotlib{b} python3-pyparsing{a} 
  0 packages upgraded, 7 newly installed, 0 to remove and 26 not upgraded.
  Need to get 10.1 MB of archives. After unpacking 28.0 MB will be used.
  The following packages have unmet dependencies:
   python3-matplotlib : Depends: python3 (&lt; 3.8) but 3.8.2-3 is installed
                        Depends: python3-kiwisolver but it is not installable
  The following actions will resolve these dependencies:
  
       Keep the following packages at their current version:
  1)     python3-matplotlib [Not Installed]                 
  
  
  
  </code></pre>
  <p><em><strong>How can solve it?</strong></em></p>
  <p>PS: this is information of my OS:</p>
  <pre><code>No LSB modules are available.
  Distributor ID: Debian
  Description:    Debian GNU/Linux bullseye/sid
  Release:        8.11
  Codename:       jessie
  </code></pre>