**Initial steps:**
1) Uninstall unitizer, command console, call as root user
2) R reports that unitizer is not installed
3) The list of installed packages is requested and with grep the names that contain unitizer are obtained
4) The list of installed packages reports two instances where the unitizer is shown as installed
5) Image that summarizes the above
**Steps with RStudio**
1) Attempting to uninstall unitizer
2) The list of installed packages is built
3) From the above list, it is checked with grep if unitizer is installed
4) Like the call to R from the command console, unitizer appears as installed
5) See the following image of RStudio that shows on the right how unitizer is not installed, and on the left the output of the RStudio Console
**Reinstalling unitizer from command console called as normal user:**
*> "hugo@hugo-MS-7978:~$ R*
*> *
*> R version 4.0.3 (2020-10-10) -- "Bunny-Wunnies Freak Out"*
*> Copyright (C) 2020 The R Foundation for Statistical Computing*
*> Platform: x86_64-pc-linux-gnu (64-bit)*
*> *
*> R es un software libre y viene sin GARANTIA ALGUNA.*
*> Usted puede redistribuirlo bajo ciertas circunstancias.*
*> Escriba 'license()' o 'licence()' para detalles de distribucion.*
*> *
*> R es un proyecto colaborativo con muchos contribuyentes.*
*> Escriba 'contributors()' para obtener más información y*
*> 'citation()' para saber cómo citar R o paquetes de R en publicaciones.*
*> *
*> Escriba 'demo()' para demostraciones, 'help()' para el sistema on-line de ayuda,*
*> o 'help.start()' para abrir el sistema de ayuda HTML con su navegador.*
*> Escriba 'q()' para salir de R.*
*> *
*> [Previously saved workspace restored]*
*> *
*> > install.packages("unitizer")*
*> Installing package into ‘/home/hugo/R/x86_64-pc-linux-gnu-library/4.0’*
*> (as ‘lib’ is unspecified)*
*> probando la URL 'https://cloud.r-project.org/src/contrib/unitizer_1.4.12.tar.gz'*
*> Content type 'application/x-gzip' length 693207 bytes (676 KB)*
*> ==================================================*
*> downloaded 676 KB*
*> *
*> * installing *source* package ‘unitizer’ ...*
*> ** package ‘unitizer’ successfully unpacked and MD5 sums checked*
*> ** using staged installation*
*> ** R*
*> ** demo*
*> ** inst*
*> ** byte-compile and prepare package for lazy loading*
*> Error in completeSubclasses(classDef2, class1, obj, where) : *
*> tentativa de obtener un slot "subclasses" de un objeto de una clase básica ("NULL") sin slots*
*> Error: package or namespace load failed for ‘dbplyr’:*
*> .onLoad failed in loadNamespace() for 'dbplyr', details:*
*> call: setClass(cl, contains = c(prevClass, "VIRTUAL"), where = where)*
*> error: error in contained classes ("character") for class “ident”; class definition removed from ‘dbplyr’*
*> Error in .requirePackage(package) : *
*> unable to find required package ‘dbplyr’*
*> Calls: <Anonymous> ... .recacheSubclasses -> getClassDef -> .requirePackage*
*> Ejecución interrumpida*
*> ERROR: lazy loading failed for package ‘unitizer’*
*> * removing ‘/home/hugo/R/x86_64-pc-linux-gnu-library/4.0/unitizer’*
*> *
*> The downloaded source packages are in*
*> ‘/tmp/Rtmp5yJsFV/downloaded_packages’*
*> Warning message:*
*> In install.packages("unitizer") :*
*> installation of package ‘unitizer’ had non-zero exit status*
*> >*
"