Good morning,
Please when you're doing some copy-pasta, don't forget to surround the content with bbcode tags such as [code]content[/code]. Not doing this lead to unreadable content and that is prohibited on our forums. Please edit your previous post to fix that issue.
Regarding your problem, please edit the `/etc/apt/preferences.d/imscp` APT preferences file and remove any pinning on the SSL related packages. Once done execute apt-get update && apt-get dist-upgrade and retry.
The problem is that you don't give us enough details about the error. As I see, there is something wrong with package dependencies but you're not showing us the exact APT error. Also, you don't say us which distribution/codename you're using.
Please provide us with the following information:
If you're not able to provide the exact error as reported by APT, you can always give us an access to your server through private conversation for further investigation.
BTW: Please edit your previous post to add bbcode tags.
The problem was due to held packages. gcc-4.9 was not installable due to broken dependencies. Somehow, the binutils package was updated to a unexpected version. Once the problem has been fixed, the LetsEncrypt plugin installation went well.
Also, I've removed all LE vhosts that you created manually using certbot. I've also purged the certbot package which was installed. The i-MSCP LetsEncrypt plugin make use of its own certbot client version. Then I've re-enabled LetsEncrypt for all involved sites through the control panel.
