I tried installing pgadmin4 on debian10 and it reported:
dpkg: error processing archive /var/cache/apt/archives/pgadmin4-web_4.24_all.deb (--unpack):
trying to overwrite '/etc/apache2/conf-available/pgadmin4.conf', which is also in package pgadmin4-apache2 4.23-1.pgdg100+1
Try force-overwriting :
sudo dpkg -i --force-overwrite /var/cache/apt/archives/pgadmin4-web_4.24_all.deb
sudo apt-get -f install
I just want to extend the answer of Thirumal. Just try to get into
cd /var/cache/apt/archives/
You will find the exact version of your pgadmin4-web there.The version at the time of writing this answer is
pgadmin4-web_4.28_all.deb
After you locate your own version then apply the following two commands
sudo dpkg -i --force-overwrite /var/cache/apt/archives/pgadmin4-web_YOUR VERSION_all.deb
sudo apt-get -f install