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CrashPlan Support

Linux CrashPlan App Version 4.5 Cannot Back Up

Applies to:
  • CrashPlan for Home
Need enterprise or small business documentation?
This article is intended for CrashPlan for Home users. For Code42 CrashPlan and CrashPlan for Small Business documentation, read this page on our enterprise support site.


Version 4.5.x and later of the CrashPlan app on Linux requires an operating system that uses Linux kernel version 2.6.32 or later (including glibc 2.9 or later). If your distribution and version of Linux use an older kernel, your CrashPlan app cannot back up.


Devices that use both of the following:

  • CrashPlan app version 4.5.x and later
  • A version of Linux that uses version 2.6.31 or earlier of the Linux kernel (including a version of glibc version 2.8 or earlier), such as:
    • Red Hat Enterprise Linux 5
    • CentOS 5
    • Debian 5
    • Ubuntu 9 and earlier


The CrashPlan app may display the message Waiting for backup. You may also see the following error in your CrashPlan app's engine_error.log:

Error looking up function 'inotify_init1': /usr/local/crashplan/jre/bin/java: undefined symbol: inotify_init1

The location of engine_error.log varies by distribution. On a default Ubuntu installation, it is stored in /usr/local/crashplan/log.

Recommended solution

To continue using up-to-date versions of CrashPlan, we recommend upgrading your operating system to a supported version of the Linux kernel.

For instructions on upgrading your Linux device, refer to the documentation for your device or your Linux distribution.

Alternative solution

If you cannot upgrade your operating system, you may choose to install an earlier version of the CrashPlan app that supports older Linux kernels.

Use At Your Own Risk
To ensure your CrashPlan app has the latest security and stability enhancements, we recommend using the latest version of the CrashPlan app. Our Customer Champions cannot assist you with known bugs or issues in earlier versions of the CrashPlan app, so you assume all risk of unintended behavior.


  • If you install an earlier version of the CrashPlan app on a device that supports a later version, the CrashPlan app is automatically upgraded when you open the app.
  • {c42_s}} prevents devices using kernel version 2.6.31 or earlier from upgrading to an unsupported version of the CrashPlan app.
Computer-to-Computer Backups
  • If you back up data from one device to another device (rather than to the Code42 cloud or an Code42 server), both devices must use the same version of the CrashPlan app.
  • If one of your devices is prevented from upgrading but your other devices will be automatically upgraded as normal, your computer-to-computer backups may not function as expected. This is expected behavior for mismatched versions of the CrashPlan app.


  1. If your device currently has version 4.5.x or later of the CrashPlan app installed, uninstall the CrashPlan app.
  2. Download version 4.4.1 of the CrashPlan app for Linux.
  3. Install the earlier version of the CrashPlan app.