[Qgis-user] does not install version 3 on ubuntu 18.04

[luis cardenas]

When following the described procedure the following error appears:

$ sudo apt-get install qgis python3-qgis qgis-plugin-grass
Reading package lists... Done
Building dependency tree
Reading state information... Done
Starting pkgProblemResolver with broken count: 1
Starting 2 pkgProblemResolver with broken count: 1
Investigating (0) qgis:amd64 < none -> 1:3.6.1+28bionic @rc puN Ib >
Broken qgis:amd64 Depends on qgis-providers:amd64 < none | 1:3.6.1+28bionic
@un uH > (= 1:3.6.1+28bionic)
  Considering qgis-providers:amd64 0 as a solution to qgis:amd64 10000
    Reinst Failed early because of qgis-providers-common:amd64
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:
 qgis : Depends: qgis-providers (= 1:3.6.1+28bionic) but it is not going to
be installed
E: Unable to correct problems, you have held broken packages.


Any Help Please.
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