Your system information

steamui.so
distro: Debian Linux 4 64bit
nvidia driver: 375.26
xserver: 1.19.1 (11901000)
Opted into Steam client beta? N
Have you checked for system updates?: Y

Please describe your issue in as much detail as possible:

start previously working steam gui

Steps for reproducing this issue:

1. start steam

attempted fixes

steam --reset

referring to
http://steamcommunity.com/app/221410/discussions/0/350542683198244989

STEAM_RUNTIME is enabled automatically
/bin/bash: /home/sparky/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu/libtinfo.so.5: no version information available (required by /bin/bash)
grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc
grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc
awk: /home/sparky/.local/share/Steam/ubuntu12_32/steam-runtime/amd64/lib/x86_64-linux-gnu/libtinfo.so.5: no version information available (required by /lib/x86_64-linux-gnu/libreadline.so.7)
grep: symbol lookup error: grep: undefined symbol: pcre_jit_stack_alloc
Installing breakpad exception handler for appid(steam)/version(1484790260)
Installing breakpad exception handler for appid(steam)/version(1484790260)
Installing breakpad exception handler for appid(steam)/version(1484790260)
Installing breakpad exception handler for appid(steam)/version(1484790260)
[2017-02-17 10:12:50] Startup - updater built Jan 19 2017 01:22:13
Looks like steam didn't shutdown cleanly, scheduling immediate update check
[2017-02-17 10:12:50] Checking for update on startup
[2017-02-17 10:12:50] Checking for available updates...
[2017-02-17 10:12:51] Download skipped: /client/steam_client_ubuntu12 version 1484790260, installed version 1484790260
[2017-02-17 10:12:51] Nothing to do
[2017-02-17 10:12:51] Verifying installation...
[2017-02-17 10:12:51] Performing checksum verification of executable files
[2017-02-17 10:12:51] Verification complete
[2017-02-17 10:12:58] Shutdown