/usr/lib/R/site-library/phylobase/nexusfiles/ is in r-cran-phylobase 0.8.4-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/R/site-library/phylobase/nexusfiles/ExContData.Rdata
/usr/lib/R/site-library/phylobase/nexusfiles/MultiLineTrees.nex
/usr/lib/R/site-library/phylobase/nexusfiles/NastyLabels.nex
/usr/lib/R/site-library/phylobase/nexusfiles/NastyLabels2.nex
/usr/lib/R/site-library/phylobase/nexusfiles/co1.nex
/usr/lib/R/site-library/phylobase/nexusfiles/minNex.nex
/usr/lib/R/site-library/phylobase/nexusfiles/minSeq.nex
/usr/lib/R/site-library/phylobase/nexusfiles/newick.tre
/usr/lib/R/site-library/phylobase/nexusfiles/noStateLabels.nex
/usr/lib/R/site-library/phylobase/nexusfiles/shorebird_underscore.nex
/usr/lib/R/site-library/phylobase/nexusfiles/testSubsetTaxa.nex
/usr/lib/R/site-library/phylobase/nexusfiles/test_min.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeRoundingError.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithContinuousData.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithDiscAndContData.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithDiscreteData.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithPolyExcludedData.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithSpecialCharacters.nex
/usr/lib/R/site-library/phylobase/nexusfiles/treeWithUnderscoreLabels.nex