tl；博士，image_optim_pack 中的二进制文件可能是针对比您尝试运行它的系统更新的系统构建的。尝试查找适用于您的系统的最新版本的 image_optim_pack。对我来说，以下版本有效：
gem "image_optim", "~> 0.25"
gem "image_optim_pack", "= 0.2.3"
更多细节
要获取有关失败的部分的信息，请运行：
$ bundle exec image_optim --info
我看到这样的事情：
$ bundle exec image_optim --info
image_optim v0.26.1
config:
verbose: true
nice: 10
threads: 4
pack: true
skip_missing_workers: true
allow_lossy: false
cache_dir:
cache_worker_digests: false
image_optim_pack: jpeg-recompress, jpegoptim, jhead, advpng, jpegtran, gifsicle, pngcrush, optipng from /path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64 failed
No pack for this OS and/or ARCH, check verbose output
Resolved jpegrescan 1a762f62 at /path/to/gems/ruby-2.4.0/gems/image_optim-0.26.1/vendor/jpegrescan
pngcrush worker: `pngcrush` not found; please provide proper binary or disable this worker (--no-pngcrush argument or `:pngcrush => false` through options)
pngout worker: `pngout` not found; please provide proper binary or disable this worker (--no-pngout argument or `:pngout => false` through options)
advpng worker: `advpng` not found; please provide proper binary or disable this worker (--no-advpng argument or `:advpng => false` through options)
optipng worker: `optipng` not found; please provide proper binary or disable this worker (--no-optipng argument or `:optipng => false` through options)
pngquant worker: `pngquant` not found; please provide proper binary or disable this worker (--no-pngquant argument or `:pngquant => false` through options)
jhead worker: `jhead` not found, `jpegtran` not found; please provide proper binary or disable this worker (--no-jhead argument or `:jhead => false` through options)
jpegoptim worker: `jpegoptim` not found; please provide proper binary or disable this worker (--no-jpegoptim argument or `:jpegoptim => false` through options)
jpegtran worker: `jpegtran` not found; please provide proper binary or disable this worker (--no-jpegtran argument or `:jpegtran => false` through options)
gifsicle worker: `gifsicle` not found; please provide proper binary or disable this worker (--no-gifsicle argument or `:gifsicle => false` through options)
svgo worker: `svgo` not found; please provide proper binary or disable this worker (--no-svgo argument or `:svgo => false` through options)
Workers by format:
它没有说明工人失败的原因。但是您可以运行工作程序二进制文件来找出：
# Path from the error message:
$ export IMAGE_OPTIM_BIN="/path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64"
$ ls $IMAGE_OPTIM_BIN
advpng gifsicle jhead jpegoptim jpeg-recompress jpegtran libjpeg.so libpng.so libz.so optipng pngcrush pngquant
$ $IMAGE_OPTIM_BIN/advpng
/path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64/advpng: /lib/libc.so.6: version `GLIBC_2.14' not found (required by /path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64/advpng)
/path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64/advpng: /lib/libc.so.6: version `GLIBC_2.14' not found (required by /path/to/gems/ruby-2.4.0/gems/image_optim_pack-0.5.0.20180419-x86_64-linux/vendor/linux-x86_64/libz.so)
我认为重要的部分是：
version `GLIBC_2.14' not found
我检查了我系统上安装的 glibc 的版本，它只有 2.12。如果您能够通过系统的包管理器升级 glibc，请先尝试。如果您无法升级 glibc，则只需使用旧版本的 gems，如上所述。