Wicked_pdf: Stylesheets and images fail to render on Ubuntu 18.04

[lisamburns]

We use the Rails assets pipeline for stylesheets and images, along with a CDN configured as an asset_host.

We upgraded from Ubuntu 14.04 (Trusty Tahr) to Ubuntu 18.04 LTS.
After the upgrade, we noticed that our PDFs generated with wicked_pdf gem were missing their styling and the logo png.

We reverted to Ubuntu 14.04 (Trusty Tahr), and it worked again.

We are running these on cloud foundry buildpack stacks (cflinuxfs3 which is built off of Ubuntu 18.04, cflinuxfs2 is built off of Ubuntu 14.04).

Versions:
wkhtmltopdf-binary (0.12.4)
wicked_pdf (1.1.0)
Rails 4.2.11

[lisamburns]

Possibly related to https://github.com/mileszs/wicked_pdf/issues/794 (since Heroku 16 is based on Ubuntu 16)

[rmldsky]

@lisamcho any chances you've found a solution/workaround for this one? Having the same problem :/

[crstamps2]

@lisamcho I am also curious if you found a solution. I have tried a few things but none work.