diff --git a/src/ci/docker/host-x86_64/test-various/Dockerfile b/src/ci/docker/host-x86_64/test-various/Dockerfile
index 147de5f8015..f5fe546cdc6 100644
--- a/src/ci/docker/host-x86_64/test-various/Dockerfile
+++ b/src/ci/docker/host-x86_64/test-various/Dockerfile
@@ -1,6 +1,6 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
   g++ \
   make \
   ninja-build \
diff --git a/src/test/ui/command/command-setgroups.rs b/src/test/ui/command/command-setgroups.rs
index 28f2bfdd3a7..2067314f740 100644
--- a/src/test/ui/command/command-setgroups.rs
+++ b/src/test/ui/command/command-setgroups.rs
@@ -3,6 +3,7 @@
 // ignore-cloudabi
 // ignore-emscripten
 // ignore-sgx
+// ignore-musl - returns dummy result for _SC_NGROUPS_MAX
 
 #![feature(rustc_private)]
 #![feature(setgroups)]