Some people have reported problems installing Mastodon v2.8.1 due to gem compilation.
This and a few other small bugs have been fixed in #Mastodon v2.8.2:
@Gargron - 2.8.1 - ruby is:
mastodon@mastodon:~/live$ ruby -v
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Related issue on gh: https://github.com/tootsuite/mastodon/issues/10712
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