On Ubuntu 20.04 I installed Bluemail. Then I tried to use the Software app to install an app called "Info Center" and got "Error while installing package: installed bluemail package post-installation script subprocess returned error exit status 1".
When I ran "sudo apt-get install -f", I got:
sudo apt-get install -f
Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up bluemail (1.1.14-536) ... Installing curl... E: Could not get lock /var/lib/dpkg/lock-frontend. It is held by process 18429 (apt-get) E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it? Unable to install curl! dpkg: error processing package bluemail (--configure): installed bluemail package post-installation script subprocess returned error exit status 1 Errors were encountered while processing: bluemail E: Sub-process /usr/bin/dpkg returned an error code (1).
Bluemail is installed and working properly and I have rebooted, so I am not sure why this error is lingering around. Can someone clue me in on how to clear it?