R installation through conda runs into error - r

Question

I am installing R through conda as follows on Ubuntu 18.04.
v=3.6.0
conda create -n env-r${v} -c r r=${v} r-ggplot2 r-gridExtra r-gtable r-tidyr r-devtools
conda activate env-r${v}
That runs ok. It installs 3.6.1 instead of 3.6.0. And then when I use R, for example, installing a package not on conda;
Rscript -e 'install.packages("label.switching", repos="https://cran.rstudio.com")'
I get this error:
Error in path.expand(new) : object 'lb' not found
Calls: .First ... .libPaths -> Sys.glob -> path.expand -> path.expand
Execution halted
If I open R and run stuff in it, there are more errors:
Error in path.expand(new) : object 'lb' not found
Calls: .First ... .libPaths -> Sys.glob -> path.expand -> path.expand
Execution halted
Error in i.p(...) :
(converted from warning) installation of package ‘rlang’ had non-zero exit status
Running conda 4.7.5.
Ran sessionInfo() inside R.
>> sessionInfo()
R version 3.6.1 (2019-07-05)
Platform: x86_64-conda_cos6-linux-gnu (64-bit)
Running under: Ubuntu 18.04.3 LTS
Matrix products: default
BLAS/LAPACK: /home/roy/miniconda3/envs/env-r3.6.0/lib/libopenblasp-r0.3.6.so
locale:
[1] LC_CTYPE=en_GB.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_GB.UTF-8 LC_COLLATE=en_GB.UTF-8
[5] LC_MONETARY=en_GB.UTF-8 LC_MESSAGES=en_GB.UTF-8
[7] LC_PAPER=en_GB.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_GB.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.6.1