I am seeing the same build error on 2 separate sites. The build gets stuck downloading Node v10 and freezes for several minutes and finally fails.
I suspect this may be a larger issue.
Site Name: icrco
10:36:45 AM: Build ready to start
10:36:47 AM: build-image version: b0258b965567defc4a2d7e2f2dec2e00c8f73ad6
10:36:47 AM: build-image tag: v3.4.1
10:36:47 AM: buildbot version: 8c957a6d09a03023cea4239847cc73a9cb64eeb7
10:36:47 AM: Fetching cached dependencies
10:36:47 AM: Starting to download cache of 1.5GB
10:37:19 AM: Finished downloading cache in 32.451154844s
10:37:19 AM: Starting to extract cache
10:37:46 AM: Finished extracting cache in 26.721189176s
10:37:47 AM: Finished fetching cache in 59.622923581s
10:37:47 AM: Starting to prepare the repo for build
10:37:47 AM: Preparing Git Reference refs/heads/master
10:37:52 AM: Different publish path detected, going to use the one specified in the Netlify configuration file: ‘public’ versus ‘public/’ in the Netlify UI
10:37:52 AM: Starting build script
10:37:52 AM: Installing dependencies
10:37:52 AM: Python version set to 2.7
10:37:53 AM: Started restoring cached node version
10:37:57 AM: Finished restoring cached node version
10:37:58 AM: Downloading and installing node v10.22.1…
10:38:01 AM: Downloading https://nodejs.org/dist/v10.22.1/node-v10.22.1-linux-x64.tar.xz…
10:47:18 AM: curl: (56) GnuTLS recv error (-54): Error in the pull function.
10:47:18 AM: Binary download from https://nodejs.org/dist/v10.22.1/node-v10.22.1-linux-x64.tar.xz failed, trying source.
10:47:18 AM: grep: /opt/buildhome/.nvm/.cache/bin/node-v10.22.1-linux-x64/node-v10.22.1-linux-x64.tar.xz: No such file or directory
10:47:18 AM: Provided file to checksum does not exist.
10:47:18 AM: Binary download failed, trying source.
10:47:18 AM: Detected that you have 8 CPU core(s)
10:47:18 AM: Running with 7 threads to speed up the build
10:47:20 AM: Clang v3.5+ detected! CC or CXX not specified, will use Clang as C/C++ compiler!
10:47:32 AM: Downloading https://nodejs.org/dist/v10.22.1/node-v10.22.1.tar.xz…
11:05:56 AM: curl: (56) GnuTLS recv error (-54): Error in the pull function.
11:05:56 AM: Binary download from https://nodejs.org/dist/v10.22.1/node-v10.22.1.tar.xz failed, trying source.
11:05:56 AM: grep: /opt/buildhome/.nvm/.cache/src/node-v10.22.1/node-v10.22.1.tar.xz: No such file or directory
11:05:56 AM: Provided file to checksum does not exist.
11:05:56 AM: Execution timed out after 28m3.90614123s
11:05:56 AM: Error running command: Command did not finish within the time limit
11:05:56 AM: Failing build: Failed to build site
11:05:56 AM: Failed during stage ‘building site’: Command did not finish within the time limit
11:05:56 AM: Finished processing build request in 29m9.416353757s