尝试使用rbenv安装Ruby时出现以下错误：
egroj97@SmallFootIV:~$ rbenv install 2.4.1
Downloading ruby-2.4.1.tar.bz2...
-> https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.1.tar.bz2
error: failed to download ruby-2.4.1.tar.bz2
BUILD FAILED (Ubuntu 16.04 using ruby-build 20170726-7-g16aa672)
Inspect or clean up the working tree at /tmp/ruby- build.20170825083100.28792
Results logged to /tmp/ruby-build.20170825083100.28792.log
Last 10 log lines:
/tmp/ruby-build.20170825083100.28792 ~
curl: (18) transfer closed with 2928469 bytes remaining to read
ruby-build.20170825083100.28792.log文件中唯一出现的内容是：
/tmp/ruby-build.20170825083100.28792 ~
curl: (18) transfer closed with 2928469 bytes remaining to read
我想问题是因为它没有完成源代码的下载，是不是有办法先下载源代码并用rbenv安装它们？或者用另一种方法安装Ruby并让rbenv识别它？