我正在运行conda install r-baseCentOS7 。如果运行，那么conda会成功安装R v3.5.3。
但是，如果我运行，conda install r-base=3.6.1它将在以下两个步骤中反复失败：
$ ./conda install r-base=3.6.1
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: - failed with repodata from current_repodata.json, will retry with next repodata source.
看起来该版本应该可用：
$ conda search r-base
Loading channels: done
# Name Version Build Channel
r-base 3.1.2 0 pkgs/r
r-base 3.1.3 0 pkgs/r
r-base 3.1.3 1 pkgs/r
r-base 3.1.3 2 pkgs/r
r-base 3.2.0 0 pkgs/r
r-base 3.2.1 0 pkgs/r
r-base 3.2.2 0 pkgs/r
r-base 3.3.1 1 pkgs/r
r-base 3.3.1 2 pkgs/r
r-base 3.3.1 3 pkgs/r
r-base 3.3.1 5 pkgs/r
r-base 3.3.1 6 pkgs/r
r-base 3.3.2 0 pkgs/r
r-base 3.3.2 1 pkgs/r
r-base 3.3.2 2 conda-forge
r-base 3.3.2 3 conda-forge
r-base 3.3.2 4 conda-forge
r-base 3.3.2 5 conda-forge
r-base 3.4.1 0 conda-forge
r-base 3.4.1 0 pkgs/r
r-base 3.4.1 1 conda-forge
r-base 3.4.1 1 pkgs/r
r-base 3.4.1 2 conda-forge
r-base 3.4.1 3 conda-forge
r-base 3.4.1 4 conda-forge
r-base 3.4.1 h4fe35fd_8 conda-forge
r-base 3.4.2 haf99962_0 pkgs/r
r-base 3.4.3 h1c2f66e_4 pkgs/r
r-base 3.4.3 h1e0a451_2 pkgs/r
r-base 3.4.3 h290ecf8_0 pkgs/r
r-base 3.4.3 h290ecf8_1 pkgs/r
r-base 3.4.3 h9bb98a2_5 pkgs/r
r-base 3.5.0 h1c2f66e_1 pkgs/r
r-base 3.5.0 h1e0a451_1 pkgs/r
r-base 3.5.1 h08e1455_1008 conda-forge
r-base 3.5.1 h1e0a451_2 pkgs/r
r-base 3.5.1 h271c98b_1006 conda-forge
r-base 3.5.1 h391c2eb_4 conda-forge
r-base 3.5.1 h391c2eb_5 conda-forge
r-base 3.5.1 hbc19587_1011 conda-forge
r-base 3.5.1 hc461eb7_1012 conda-forge
r-base 3.5.1 he45234b_1004 conda-forge
r-base 3.5.1 he45234b_1005 conda-forge
r-base 3.5.1 hea2b9be_1007 conda-forge
r-base 3.5.1 hfb2a302_1009 conda-forge
r-base 3.5.1 hfb2a302_1010 conda-forge
r-base 3.5.3 h067a564_0 pkgs/r
r-base 3.5.3 h26b83e4_0 pkgs/r
r-base 3.6.0 hce969dd_0 pkgs/r
r-base 3.6.1 h3a67422_6 conda-forge
r-base 3.6.1 h6e652e1_3 conda-forge
r-base 3.6.1 h8900bf8_0 conda-forge
r-base 3.6.1 h8900bf8_1 conda-forge
r-base 3.6.1 h8900bf8_2 conda-forge
r-base 3.6.1 h9bb98a2_1 pkgs/r
r-base 3.6.1 hba50c9b_4 conda-forge
r-base 3.6.1 hba50c9b_5 conda-forge
r-base 3.6.1 hce969dd_0 pkgs/r
r-base 3.6.2 h3a67422_0 conda-forge
r-base 3.6.2 h7ed4ef7_1 conda-forge
r-base 3.6.3 h7ed4ef7_0 conda-forge
r-base 3.6.3 h7ed4ef7_1 conda-forge
可能是什么问题？
您的环境中可能有冲突的软件包。尝试创建一个新的并安装在其中：
conda create -n newEnv -c conda-forge r-base=3.6.1
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我来说两句