I can confirm that the kernel in bionic-proposed fixes the problem:

```
root@xam-softiron-1:/# gacutil -l
Illegal instruction (core dumped)
```

->

```
root@xam-softiron-1:/# gacutil -l
The following assemblies are installed into the GAC:
Mono.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756
Mono.Security.Providers.DotNet, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=0738eb9f132ed756
Mono.Security.Providers.NewSystemSource, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=0738eb9f132ed756
Mono.Security.Providers.NewTls, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=0738eb9f132ed756
Mono.Security.Providers.OldTls, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=0738eb9f132ed756
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Configuration, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a
System.Security, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a
System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Number of items = 9
```

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1545542

Title:
  Enable arm64 emulation of removed ARMv7 instructions

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Zesty:
  New
Status in linux source package in Artful:
  New
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  Linux now supports emulation of three deprecated ARMv7 features that
  were removed from ARMv8: SWP(B), CP15ISB/DSB/DMB, and SETEND. At least
  CP15DMB is used by some armhf archive binaries (notably pandoc), so we
  need emulation enabled on the kernels that scalingstack uses.

  I haven't checked which version added which, but they appeared some
  time between 3.13 and 4.2, and I only care about 4.2 onwards. So
  please enable ARMV8_DEPRECATED, SWP_EMULATION, CP15_BARRIER_EMULATION
  and SETEND_EMULATION in arm64 kernels for wily onwards.

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