LWT installation failed using OPAM - opam

LWT installation failed using OPAM on Ubuntu
Server Information -
Distributor ID: Ubuntu,
Description: Ubuntu 18.04.4,
LTS Release: 18.04,
Codename: bionic
Steps I followed -
opam list -a # List the available packages
opam install lwt # Install LWT
opam update # Update the package list
...
opam upgrade # Upgrade the installed packages to their latest version
Error I got -
=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
∗ install lwt 4.1.0
∗ install ocamlfind 1.8.0
The following actions failed
∗ install conf-m4 1
No changes have been performed
I even tried opam depext conf-m4.1 but didn't help.

After following these -
opam depext conf-m4.1
sudo opam install lwt
the problem is solved - but sudo is not recommended.

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installing R 4.0.2 in ubuntu 18.04

I am trying to install R version 4.0.2 on ubuntu 18.04 but it shows this message:
The following packages have unmet dependencies:
r-base : Depends: r-base-core (>= 4.0.3-1.2004.0) but it is not going to be installed
Depends: r-recommended (= 4.0.3-1.2004.0) but it is not going to be installed
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E: Unable to correct problems, you have held broken packages.
You have to remove problematic PPA (it does no publish packages for 18.04 LTS - bionic) first with:
sudo add-apt-repository -r ppa:grass/grass-stable
and then update your package lists
sudo apt-get update
and install new updates with their dependencies by
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sudo add-apt-repository -r 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran35/'
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In order to install the last R version in Ubuntu LTS >= 16.04. (amongst other 18.04) follow the instructions at CRAN. If you have already installed the distro version of R remove it with the package manager.
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sudo apt update -qq
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Add the signing key (by Michael Rutter) for these repos
wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | sudo tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc
Add the R 4.0 repo from CRAN
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Package conflict while installing ms-sql in ubuntu. Broken packages

I am trying to install ms sql in Ubuntu 20.04. Even I have got it installed in 20.04 successfully following this guide but I sometime I have this problem multiple time and not sure why is this happening.
When I try to run following commads
curl https://packages.microsoft.com/config/ubuntu/18.04/prod.list | sudo tee /etc/apt/sources.list.d/msprod.list
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I end up having below errors:
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I tried installing the right versions for dependencies that did not help when I ran sudo apt-get install mssql-tools unixodbc-dev again.
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Now when I do sudo apt update it ends up with below error:
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N: See apt-secure(8) manpage for repository creation and user configuration details.
I really don't understand what is happening and what I have to do to get thing working in simplest way.
Do as follow:
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python3-pip is already the newest version (9.0.1-2.3~ubuntu1.18.04.1).
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E: Sub-process /usr/bin/dpkg returned an error code (1)
I understand dpkg is the Debian pkg manager but I am unsure of the best next step.
do you try to missing package by this command
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I got an error :
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What did I miss ?
Thanks in advance.

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