Thanks for the clear repro

Was this canary or dev chrome?

Ah sorry, the crostini-bug link seems to not include the information that crbug.com/new does.

dev-channel:
Chrome Version: 68.0.3416.0
OS Version: 10635.0.0

Thank you. Trying now to repro from tip-of-tree

I can't repro this as written from Tip of tree. 

However, if we add 
3.a. Click Terminal in launcher (while signed in to profile #2)
4. Switch back to profile #1 (before a Terminal comes up),

Then I get the Terminal with avatar for profile #2 showing up in profile #1

 Issue 839244  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3d79d513758271479430816a5db15a5a414901b1

commit 3d79d513758271479430816a5db15a5a414901b1
Author: Nicholas Verne <nverne@chromium.org>
Date: Tue May 15 06:29:58 2018

Restrict crostini UI to primary profile

Crostini multiprofile support is going to wait until the successor for
multiprofile is landed on ChromeOS. Until then, we restrict Crostini to the
primary (i.e. first signed in) profile per session. This means that you can
still have Linux containers per profile, but to use then you need to sign out
then sign in to the desired profile.

Note, this prevents UI from being shown to the non-primary profile. It doesn't
prevent non-primary users from using crosh and vmc.

Bug:  842561 
Change-Id: I119359b332e7a3afa02071c1e9d9e6f41164fe4d
Reviewed-on: https://chromium-review.googlesource.com/1058738
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558627}
[modify] https://crrev.com/3d79d513758271479430816a5db15a5a414901b1/chrome/browser/chromeos/crostini/crostini_util.cc

 Issue 843193  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/787965b98618fcf687109119b0c8a825c3f889a7

commit 787965b98618fcf687109119b0c8a825c3f889a7
Author: Nicholas Verne <nverne@chromium.org>
Date: Fri May 18 05:24:43 2018

Roll src/third_party/cros_system_api/ ce8067bec..40aa75e44 (3 commits)

https://chromium.googlesource.com/chromiumos/platform/system_api.git/+log/ce8067becb65..40aa75e44dda

$ git log ce8067bec..40aa75e44 --date=short --no-merges --format='%ad %ae %s'
2018-05-16 nverne Add owner_id to messages that need it.
2018-03-30 derat system_api: Remove org.chromium.LibCrosService constants.
2018-05-07 emaxx cryptohome: Pass D-Bus delegate for challenge keys

Created with:
  roll-dep src/third_party/cros_system_api

Bug:  842561 
Change-Id: Ie5d14afb8bed77a42d54446f1b36645640f3aecc
Reviewed-on: https://chromium-review.googlesource.com/1064655
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559807}
[modify] https://crrev.com/787965b98618fcf687109119b0c8a825c3f889a7/DEPS

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/37c9fcae984bc45d2ae487d32bc41c66ec7368af

commit 37c9fcae984bc45d2ae487d32bc41c66ec7368af
Author: Nicholas Verne <nverne@chromium.org>
Date: Tue May 22 01:02:06 2018

Support the owner_id field for CrostiniManager methods.

This allows Crostini to "play nice" with current multiprofile situations.
Note that Concierge itself needs to change to support owner_id too.

Bug:  842561 
Change-Id: Ie71fa5e7015f940b50fc80eb2188ae389d2a8a12
Reviewed-on: https://chromium-review.googlesource.com/1065835
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560438}
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_manager.cc
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_manager.h
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_manager_unittest.cc
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_registry_service.cc
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_registry_service.h
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_remover.cc
[modify] https://crrev.com/37c9fcae984bc45d2ae487d32bc41c66ec7368af/chrome/browser/chromeos/crostini/crostini_util.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/560b33dc46e65da5ce3f8f6d86c03a019dc6695e

commit 560b33dc46e65da5ce3f8f6d86c03a019dc6695e
Author: Nicholas Verne <nverne@chromium.org>
Date: Wed May 23 10:03:30 2018

Roll src/third_party/cros_system_api/ 40aa75e44..f6223168d (3 commits)

https://chromium.googlesource.com/chromiumos/platform/system_api.git/+log/40aa75e44dda..f6223168d99e

$ git log 40aa75e44..f6223168d --date=short --no-merges --format='%ad %ae %s'
2018-05-22 nverne Add owner_id to message StartVmRequest
2018-05-21 brunokim Notify ARC on boot that supervision state changed.
2018-05-21 yusukes arc: Remove StartArcInstanceRequest message

Created with:
  roll-dep src/third_party/cros_system_api

Bug:  842561 
Change-Id: Id86b391b25cfc46feb2af21e8fa84a75a660c976
Reviewed-on: https://chromium-review.googlesource.com/1070010
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561019}
[modify] https://crrev.com/560b33dc46e65da5ce3f8f6d86c03a019dc6695e/DEPS

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0c998d0d7624020683f18d4c384c26b22c77c8df

commit 0c998d0d7624020683f18d4c384c26b22c77c8df
Author: Nicholas Verne <nverne@chromium.org>
Date: Fri May 25 01:41:22 2018

Sets owner_id in CrostiniManager::StartTerminaVm.

This lets Concierge correctly associate a VM with the current user

Bug:  842561 
Change-Id: Id313c9d7514575850ba4961afe968acd7d797ec9
Reviewed-on: https://chromium-review.googlesource.com/1072210
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561730}
[modify] https://crrev.com/0c998d0d7624020683f18d4c384c26b22c77c8df/chrome/browser/chromeos/crostini/crostini_manager.cc
[modify] https://crrev.com/0c998d0d7624020683f18d4c384c26b22c77c8df/chrome/browser/chromeos/crostini/crostini_manager.h
[modify] https://crrev.com/0c998d0d7624020683f18d4c384c26b22c77c8df/chrome/browser/chromeos/crostini/crostini_manager_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform2/+/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b

commit 3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b
Author: Nicholas Verne <nverne@chromium.org>
Date: Wed May 30 19:50:47 2018

vm_host_tools: Keys Concierge's |vms_| by (owner_id, vm_name)

This prevents vm collisions in multiprofile situations when the same
vm name has been used by different profiles.

BUG= chromium:842561 
TEST=manual testing.
Change-Id: I49130f6248d81d9bdeebf94a70eb7e23d9201cac
Reviewed-on: https://chromium-review.googlesource.com/1071328
Commit-Ready: Nicholas Verne <nverne@chromium.org>
Tested-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>

[modify] https://crrev.com/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b/vm_tools/concierge/service.h
[modify] https://crrev.com/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b/vm_tools/vsh/vsh.cc
[modify] https://crrev.com/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b/vm_tools/concierge/service.cc
[modify] https://crrev.com/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b/vm_tools/concierge/client.cc
[modify] https://crrev.com/3ff75f5d53e9aeadb1c88ef635e5ce7b0186b06b/crosh/crosh

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ec70c0c324e8d3898cc504d83743974b516b37b0

commit ec70c0c324e8d3898cc504d83743974b516b37b0
Author: Nicholas Verne <nverne@chromium.org>
Date: Thu May 31 00:53:15 2018

Crostini's terminal passes cryptohome_id to vmshell.

This ensures that the underlying vsh implementation connects to the correct
VM via Concierge service. Another CL impelments the Concierge side of this
change.

Bug:  842561 
Change-Id: I9d0f84cffd111e86760369c3f7d060580aef44b3
Reviewed-on: https://chromium-review.googlesource.com/1074803
Commit-Queue: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563093}
[modify] https://crrev.com/ec70c0c324e8d3898cc504d83743974b516b37b0/chrome/browser/chromeos/crostini/crostini_manager.cc