Doesn't seem to be a Ubuntu issue. I created a Ubuntu 16.04 Azure VM and ran a successful build on it with the following version of Mono:
Mono JIT compiler version 5.8.0.108 (tarball Fri Jan 19 18:15:21 UTC 2018)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen (concurrent by default)
Yes we know that, we've upgraded our Bitrise image to .NET Core 2.1.4, as that's what's going to be used coming cake releases, but current development is on 1.1.x.
That's why the PR #1812 isn't failing, which basically is what will be the 0.26.0 release.
Closing this as resolved in the v0.30.0 milestone as part of the v0.30.0 release.
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Yes we know that, we've upgraded our Bitrise image to .NET Core 2.1.4, as that's what's going to be used coming cake releases, but current development is on 1.1.x.
That's why the PR #1812 isn't failing, which basically is what will be the 0.26.0 release.