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I am trying to install libcurl3 in my system. libcurl4 is already installed in my system.

The problem is, installation process is removing my R installation with installed packages.

user@len-lin:~$ sudo apt install libcurl3

[sudo] password for user: 

Reading package lists... Done

Building dependency tree       

Reading state information... Done

The following packages were automatically installed and are no longer required:

  cdbs dh-translations fonts-glewlwyd fonts-mathjax intltool jq libblas-dev libc-ares2 libhttp-parser2.7.1 libjq1

  libjs-bootstrap libjs-d3 libjs-es5-shim libjs-highlight.js libjs-jquery-datatables libjs-jquery-metadata

  libjs-jquery-selectize.js libjs-jquery-tablesorter libjs-jquery-ui libjs-json libjs-mathjax libjs-microplugin.js

  libjs-sifter.js libjs-twitter-bootstrap libjs-twitter-bootstrap-datepicker liblapack-dev libncurses5-dev libnlopt0

  libonig4 libqt5multimedia5 libreadline-dev libtinfo-dev libuv1 node-highlight.js nodejs nodejs-doc python3-scour

  r-doc-html scour

Use 'sudo apt autoremove' to remove them.

The following packages will be REMOVED:

  libcurl4 libcurl4-openssl-dev littler r-base r-base-core r-base-dev r-base-html r-cran-amelia r-cran-animation

  r-cran-assertthat r-cran-bindr r-cran-bindrcpp r-cran-bitops r-cran-boot r-cran-cairo r-cran-cairodevice r-cran-car

  r-cran-cardata r-cran-caret r-cran-catools r-cran-class r-cran-cli r-cran-cluster r-cran-clustergeneration

  r-cran-codetools r-cran-colorspace r-cran-crayon r-cran-crosstalk r-cran-curl r-cran-cvst r-cran-data.table

  r-cran-ddalpha r-cran-deoptimr r-cran-devtools r-cran-dichromat r-cran-digest r-cran-dimred r-cran-dplyr r-cran-drr

  r-cran-e1071 r-cran-evaluate r-cran-filehash r-cran-foreach r-cran-foreign r-cran-gdata r-cran-ggplot2 r-cran-git2r

  r-cran-glue r-cran-gmodels r-cran-gower r-cran-gplots r-cran-gregmisc r-cran-gridextra r-cran-gtable r-cran-gtools

  r-cran-highr r-cran-hms r-cran-htmltools r-cran-htmlwidgets r-cran-httpuv r-cran-httr r-cran-ipred r-cran-iterators

  r-cran-jsonlite r-cran-kernlab r-cran-kernsmooth r-cran-knitr r-cran-labeling r-cran-lattice r-cran-lava

  r-cran-lazyeval r-cran-littler r-cran-lme4 r-cran-lubridate r-cran-magrittr r-cran-maps r-cran-markdown r-cran-mass

  r-cran-matrix r-cran-matrixmodels r-cran-memoise r-cran-mgcv r-cran-mime r-cran-minqa r-cran-misctools

  r-cran-modelmetrics r-cran-multicore r-cran-munsell r-cran-nlme r-cran-nloptr r-cran-nlp r-cran-nnet r-cran-numderiv

  r-cran-openssl r-cran-pbkrtest r-cran-pillar r-cran-pkgconfig r-cran-pkgkitten r-cran-plyr r-cran-png r-cran-prodlim

  r-cran-purrr r-cran-quantreg r-cran-r6 r-cran-rcolorbrewer r-cran-rcpp r-cran-rcppeigen r-cran-rcpproll r-cran-rcurl

  r-cran-readr r-cran-recipes r-cran-reshape r-cran-reshape2 r-cran-rgl r-cran-rlang r-cran-robustbase r-cran-rpart

  r-cran-rstudioapi r-cran-scales r-cran-sfsmisc r-cran-shiny r-cran-slam r-cran-sourcetools r-cran-sparsem

  r-cran-spatial r-cran-stringi r-cran-stringr r-cran-survival r-cran-tibble r-cran-tidyr r-cran-tidyselect

  r-cran-tikzdevice r-cran-timedate r-cran-timeseries r-cran-tkrplot r-cran-tm r-cran-utf8 r-cran-viridislite

  r-cran-whisker r-cran-withr r-cran-xml2 r-cran-xtable r-cran-yaml r-recommended uget

The following NEW packages will be installed:

  libcurl3

0 upgraded, 1 newly installed, 145 to remove and 30 not upgraded.

Need to get 214 kB of archives.

After this operation, 195 MB disk space will be freed.

Do you want to continue? [Y/n] 

Is there any way installing libcurl3 without removing R? Some of the softwares I want to use require libcurl3.

sudo add-apt-repository ppa:xapienz/curl34

sudo apt policy curl

sudo apt remove curl libcurl4

Then try:

sudo apt install curl=7.58.0-2ubuntu3ppa2 libcurl4=7.58.0-2ubuntu3ppa2

or

sudo apt install libcurl4

This will install libcurl4 package, which supports both libcurl3 and libcurl4 API. Then you do need to install another libcurl3 package for your system.