Public bug reported:

lsb_release -rd
Description:    Ubuntu 20.04 LTS
Release:        20.04

$apt-cache policy gcc-10-base
gcc-10-base:
  Installed: 10-20200416-0ubuntu1~18.04
  Candidate: 10-20200416-0ubuntu1~18.04
  Version table:
 *** 10-20200416-0ubuntu1~18.04 100
        100 /var/lib/dpkg/status
     10-20200411-0ubuntu1 500
        500 http://repo.isra.edu.pk/ubuntu focal/main amd64 Packages


I have upgrade from ubuntu 18.04. most libraries are not upgraded i.e 
GCC-10-base. multiple libraries are not installed and when I try to install 
them. error will generate that GCC-10-base  2020-04 required but 18.04 is 
installed. I have remove all absolute packages and replace all packages. when I 
try to remove GCC-10-base or reinstall then the error is generated. multiple 
packages have broken during up-gradation.

``` reading package lists... Done
Building dependency tree       
Reading state information... Done
Reinstallation of gcc-10-base is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.```

``` 
The following packages have unmet dependencies:
 libfcl-dev : Depends: libflann-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

```
I have continued to add missing packages in the list. but at the end following 
the problem raises.

```
sudo apt install gcc-10-base libgcc-10-dev  gcc-10  libgfortran-10-dev  
libgfortran5 gfortran-10  libhdf5-openmpi-103 libopenmpi-dev libopenmpi-dev  
libhdf5-openmpi-dev mpi-default-dev  libhdf5-mpi-dev  libflann-dev  libfcl-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gcc-10-base is already the newest version (10-20200416-0ubuntu1~18.04).
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:
 gcc-10 : Depends: cpp-10 (= 10-20200411-0ubuntu1) but it is not going to be 
installed
          Depends: gcc-10-base (= 10-20200411-0ubuntu1) but 
10-20200416-0ubuntu1~18.04 is to be installed
 gfortran-10 : Depends: gcc-10-base (= 10-20200411-0ubuntu1) but 
10-20200416-0ubuntu1~18.04 is to be installed
 libgcc-10-dev : Depends: gcc-10-base (= 10-20200411-0ubuntu1) but 
10-20200416-0ubuntu1~18.04 is to be installed
                 Depends: libasan6 (>= 10-20200411-0ubuntu1) but it is not 
going to be installed
 libgfortran-10-dev : Depends: gcc-10-base (= 10-20200411-0ubuntu1) but 
10-20200416-0ubuntu1~18.04 is to be installed
 libgfortran5 : Depends: gcc-10-base (= 10-20200411-0ubuntu1) but 
10-20200416-0ubuntu1~18.04 is to be installed
E: Unable to correct problems, you have held broken packages.
```
I am going to remove but ubuntu say 
```
sudo apt remove  gcc-10-base
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:
 libgcc-s1 : Depends: gcc-10-base (= 10-20200416-0ubuntu1~18.04) but it is not 
going to be installed
 libxml2 : Depends: libicu66 (>= 66.1-1~) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by 
held packages.


$sudo apt install doxygen
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libxapian30
Suggested packages:
  doxygen-latex doxygen-doc doxygen-gui graphviz xapian-tools
The following NEW packages will be installed:
  doxygen libxapian30
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 661 kB/10.3 MB of archives.
After this operation, 46.1 MB of additional disk space will be used.
Do you want to continue? [Y/n] y
Err:1 http://repo.isra.edu.pk/ubuntu focal/universe amd64 libxapian30 amd64 
1.4.14-2
  404  Not Found [IP: 121.52.154.237 80]
E: Failed to fetch 
http://repo.isra.edu.pk/ubuntu/pool/universe/x/xapian-core/libxapian30_1.4.14-2_amd64.deb
  404  Not Found [IP: 121.52.154.237 80]
E: Unable to fetch some archives, maybe run apt-get update or try with 
--fix-missing?

```


I expected after degradation all packages must upgrade into ubuntu 20.04.
but multiple packages have not upgraded even I have replaced all packages and 
remove all old and absolute packages.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.18
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 20 10:09:49 2020
InstallationDate: Installed on 2020-02-12 (67 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to focal on 2020-04-19 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade focal third-party-packages

-- 
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https://bugs.launchpad.net/bugs/1873731

Title:
  i have upgrade from ubuntu 18.04 . most libraries are not upgrade  i.e
  gcc-10-base. multiple library are not install and when i try to
  install them. error will generate that gcc-10-base  2020-04 required
  but 18.04 is install. i have remove all absolute packages and replace
  all package. when i try to remove gcc-10-base or reinstall then error
  are generated. multiple package have broken during up-gradation.

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