I was trying to install Seedsync.
I followed the instructions on their github

    Download the deb package from the latest release

    Install the deb package:

    sudo dpkg -i <deb file>

When I try to install the deb package I get this error

Selecting previously unselected package seedsync.
(Reading database ... 276845 files and directories currently installed.)
Preparing to unpack seedsync_0.6-0_amd64.deb ...
Unpacking seedsync (0.6-0) ...
dpkg: dependency problems prevent configuration of seedsync:
 seedsync depends on libreadline6 (>= 6.0); however:
  Package libreadline6 is not installed.

dpkg: error processing package seedsync (--install):
 dependency problems - leaving unconfigured
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Errors were encountered while processing:

Trying to install libreadline6 tell me that it's either moved somewhere else or obsolete.


sudo apt-get install libreadline6 

gives me

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package libreadline6 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libreadline6' has no installation candidate


Tring to install libc-bin or libreadline7 shows that it's already the newest version, 0 upgraded,0 newly installed and 0 not upgraded.

The seedsync package asks for libreadline6 (>=6.0) and I think I have libreadline7

apt-get install libreadline7
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libreadline7 is already the newest version (7.0-3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.    

This Github Issues seems to be similar. Apparently, the issue is between packages prepared for Ubuntu vs packages made for Debian. The proposed workaround is to use the Dockerfile which actually uses Ubuntu

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