Your system information

• Running Steam on debian 9 64-bit
  STEAM_RUNTIME is enabled automatically
  Pins up-to-date!
• OS: Debian
• Beta: No
• Have you checked for system updates?: Yes

I start steam via a terminal an it gets stuck on:

Installing breakpad exception handler for appid(steam)/version(1527879669)
assert_20180604045121_26.dmp[11411]: Uploading dump (out-of-process)
/tmp/dumps/assert_20180604045121_26.dmp
[0604/045122.171260:WARNING:crash_reporting.cc(254)] Failed to set crash key: UserID with value: 0
[0604/045122.171338:WARNING:crash_reporting.cc(254)] Failed to set crash key: BuildID with value: 1527872254
[0604/045122.171345:WARNING:crash_reporting.cc(254)] Failed to set crash key: SteamUniverse with value: Public
[0604/045122.171350:WARNING:crash_reporting.cc(254)] Failed to set crash key: Version with value: 20180601165734
[0604/045122.171356:WARNING:crash_reporting.cc(254)] Failed to set crash key: ProductName with value: cefwebhelper
[0604/045122.171361:WARNING:crash_reporting.cc(254)] Failed to set crash key: Vendor with value: Valve
Failed to init SteamVR because it isn't installed
ExecCommandLine: "'/home/doctorapparatus/.local/share/Steam/ubuntu12_32/steam'"
System startup time: 13.72 seconds
assert_20180604045121_26.dmp[11411]: Finished uploading minidump (out-of-process): success = yes
assert_20180604045121_26.dmp[11411]: response: CrashID=bp-d9e0667d-55ff-467d-b6f2-1405c2180604
assert_20180604045121_26.dmp[11411]: file ''/tmp/dumps/assert_20180604045121_26.dmp'', upload yes: ''CrashID=bp-d9e0667d-55ff-467d-b6f2-1405c2180604''
[0604/045123.723036:WARNING:render_frame_host_impl.cc(2751)] OnDidStopLoading was called twice.
Installing breakpad exception handler for appid(steam)/version(1527879669)

Steps for reproducing this issue:

1. Install steam
2. Install games
3. Enable Family Mode
4. Enable Family Game Sharing
5. Restart Steam