WebDriverException: Message: Service chromedriver unexpectedly exited. Status code was: 127

by

It seems chromedriver needs some extra libraries. This solved the issue for me:

apt-get install -y libglib2.0-0=2.50.3-2 \
    libnss3=2:3.26.2-1.1+deb9u1 \
    libgconf-2-4=3.2.6-4+b1 \
    libfontconfig1=2.11.0-6.7+b1

I was working on a similar setup using a docker container instead of a server/VM without X / GUI.

To figure out which dependencies are required I tried iteratively to run it from the command line like this: /opt/chromedriver/2.33/chromedriver --version over and over again.

Then at eache time I used commands like apt-cache search <STUFF> and apt-cache madison <STUFF> to figure out the exact version of the deb package needed by chromedriver 2.33 (in my case, but I guess something similar would work for any version of chromedriver).

Edit

As suggested in the comments, using the ldd command to print shared object dependencies may be another option. As of today my chromedriver version after a few years from the original answer is 83.0.4103.14 – the dependencies are different as well, but see below to get an idea of what could be missing:

$ /usr/local/bin/chromedriver --version
ChromeDriver 83.0.4103.14 (be04594a2b8411758b860104bc0a1033417178be-refs/branch-heads/4103@{#119})
$ ldd /usr/local/bin/chromedriver
        linux-vdso.so.1 (0x00007fffff7f0000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f414739d000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f414737a000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f414736f000)
        libglib-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0 (0x00007f4147246000)
        libnss3.so => /usr/lib/x86_64-linux-gnu/libnss3.so (0x00007f41470f7000)
        libnssutil3.so => /usr/lib/x86_64-linux-gnu/libnssutil3.so (0x00007f41470c4000)
        libnspr4.so => /usr/lib/x86_64-linux-gnu/libnspr4.so (0x00007f4147082000)
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f4146f45000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f4146df6000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f4146ddb000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f4146be9000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f4147e56000)
        libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3 (0x00007f4146b76000)
        libplc4.so => /usr/lib/x86_64-linux-gnu/libplc4.so (0x00007f4146b6d000)
        libplds4.so => /usr/lib/x86_64-linux-gnu/libplds4.so (0x00007f4146b68000)
        libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f4146b3e000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f4146b38000)
        libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f4146b30000)
        libbsd.so.0 => /usr/lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f4146b14000)

From man ldd:

ldd prints the shared objects (shared libraries) required by each program or shared object specified on the command line.

…

In the usual case, ldd invokes the standard dynamic linker (see ld.so(8))
with the LD_TRACE_LOADED_OBJECTS environment variable set to 1. This
causes the dynamic linker to inspect the program’s dynamic
dependencies, and find (according to the rules described in ld.so(8))
and load the objects that satisfy those dependencies. For each
dependency, ldd displays the location of the matching object and the
(hexadecimal) address at which it is loaded.

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