$ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.2 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.2 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
$ dpkg -l flirc
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-=================================
ii flirc 3.25.3 amd64 no description given
$ ldd /usr/bin/flirc_util
linux-vdso.so.1 (0x00007ffe453d8000)
libreadline.so.6 => not found
libusb-1.0.so.0 => /lib/x86_64-linux-gnu/libusb-1.0.so.0 (0x00007f7de9b4c000)
libhidapi-hidraw.so.0 => /lib/x86_64-linux-gnu/libhidapi-hidraw.so.0 (0x00007f7de9b45000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f7de9b22000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f7de9930000)
libudev.so.1 => /lib/x86_64-linux-gnu/libudev.so.1 (0x00007f7de9903000)
/lib64/ld-linux-x86-64.so.2 (0x00007f7de9b7a000)
libreadline6 is not available in ubuntu, it would be best to update the package to use libreadline8, or libreadline5 which seems to be available still.
This may have been taken care of with 3.25.4 (if I could download the package I would check myself) but if not could you please add it to the todo list for 3.25.5.
The /usr/bin/Flirc gui works just fine, but others may want the command line.
