diagnosing Ubuntu fails in Travis

[wibeasley]

@IndrajeetPatil, in response to #23, I'll try a few things in sequence to isolate the problem, including

• temporarily disable OS-X builds in the matrix (in case they're timing out --but I don't think that's the case).

At the very least, that should buy you some extra run time on Travis before the time-limit is reached.

• experiment w/ location of the package sources, which hopefully addresses this error message

The command "eval sudo apt-get install -y r-cran-stringi r-cran-magrittr r-cran-curl r-cran-jsonlite r-cran-rcpp r-cran-bindrcpp r-cran-rcppeigen r-cran-openssl r-cran-rlang r-cran-utf8 r-cran-gss r-cran-haven r-cran-data.table r-cran-dplyr r-cran-purrr r-cran-tidyr r-cran-readr r-cran-minqa r-cran-mvtnorm r-cran-nloptr r-cran-sparsem r-cran-lme4 r-cran-httpuv r-cran-markdown r-cran-sem r-cran-readxl r-cran-openxlsx r-cran-pander " failed. Retrying, 2 of 3.

[wibeasley]

@IndrajeetPatil, I'm sorry, I'm stuck myself. FWIW, I am having trouble with some dependencies in Travis myself now too. One advantage I have is that my package doesn't have 45+ min of dependencies to build first, which gives me more options.

I don't know if these problems are related to each other and/or R.3.5.0. I'm not seeing anything on Stack Overflow with the r and travis-ci tags.

I'll reopen if I see anything.

[IndrajeetPatil]

@wibeasley Thank you so much trying!

Yeah, apparently it has been difficult to get the build to succeed on linux machines because devtools is broken for R 3.5.0, or something like that.

Here are some relevant things I have found-

1. Travis build R 3.5 ropensci/codemetar#117
2. rrutter devtools broken with R 3.5 travis-ci/travis-ci#9540 (comment)

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