Update linux-instructions.md (#25187)

Update ubuntu arm container version

diff --git a/Documentation/building/linux-instructions.md b/Documentation/building/linux-instructions.md
index b3c52a5..c1a4bcc 100644 (file)
--- a/Documentation/building/linux-instructions.md
+++ b/Documentation/building/linux-instructions.md
@@ -51,7 +51,7 @@ Docker Images
 | Alpine                      | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.6-e2521f8-20180716231200`                     | -                    | -             |
 | CentOS 6 (build for RHEL 6) | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:centos-6-376e1a3-20174311014331`                       | -                    | -             |
 | CentOS 7 (build for RHEL 7) | x64             | `mcr.microsoft.com/dotnet-buildtools/prereqs:centos-7-d485f41-20173404063424`                       | -                    | -             |
-| Ubuntu 14.04                | arm32(armhf)    | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-14.04-cross-e435274-20180426002420`             | `/crossrootfs/arm`   | -             |
+| Ubuntu 14.04                | arm32(armhf)    | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-14.04-23cacb0-20190528233931`             | `/crossrootfs/arm`   | -             |
 | Ubuntu 16.04                | arm64 (arm64v8) | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-a3ae44b-20180315221921`       | `/crossrootfs/arm64` | -             |
 | Alpine                      | arm64 (arm64v8) | `mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-16.04-cross-arm64-alpine10fcdcf-20190208200917` | `/crossrootfs/arm64` | -clang5.0     |