[Bug 1820617] Re: subiquity install fails: kernel modules not found

[Steve Langasek]

This was a critical bug that prevented installations of Ubuntu 19.04
from working during the devel series with the server live image.  We
certainly did not release Ubuntu 19.04 with an installer image that
could not install Ubuntu.  If you think there is something wrong with
the Ubuntu 19.04 installer, please file a new bug report with logs
showing exactly what is happening on your system.

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Title:
  subiquity install fails: kernel modules not found

Status in livecd-rootfs package in Ubuntu:
  Fix Released
Status in livecd-rootfs source package in Bionic:
  Confirmed

Bug description:
  Since 2019-03-18 the disco and bionic amd64-smoke-default tests (i.e.
  the basic installation using all the default installer options) are
  failing. The installation fails because the installer tries to load
  some kernel modules which are not found on the system, and
  /lib/modules is indeed empty. The relevant syslog excerpt for a failed
  install follows, while attached is the full syslog.

  curtin_log.1438[1688]: Running command ['modprobe', '--use-blacklist', 'bcache'] with allowed return codes [0] (capture=False)
  curtin_log.1438[1688]: modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.15.0-47-generic/modules.dep.bin'
  curtin_event.1438[1708]: finish: cmd-install/stage-partitioning/builtin/cmd-block-meta/clear-holders: FAIL: removing previous storage devices
  curtin_event.1438[1708]: finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta
  curtin_log.1438[1688]: modprobe: FATAL: Module bcache not found in directory /lib/modules/4.15.0-47-generic
  curtin_log.1438[1688]: finish: cmd-install/stage-partitioning/builtin/cmd-block-meta/clear-holders: FAIL: removing previous storage devices
  curtin_log.1438[1688]: TIMED BLOCK_META: 0.323                                     
  curtin_log.1438[1688]: finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta
  curtin_log.1438[1688]: Traceback (most recent call last):                          
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/commands/main.py", line 201, in main
  curtin_log.1438[1688]:     ret = args.func(args)                                   
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/log.py", line 97, in wrapper
  curtin_log.1438[1688]:     return log_time("TIMED %s: " % msg, func, *args, **kwargs)
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/log.py", line 79, in log_time
  curtin_log.1438[1688]:     return func(*args, **kwargs)                            
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 74, in block_meta
  curtin_log.1438[1688]:     meta_clear(devices, state.get('report_stack_prefix', ''))
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/commands/block_meta.py", line 1555, in meta_clear
  curtin_log.1438[1688]:     clear_holders.start_clear_holders_deps()                
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/block/clear_holders.py", line 638, in start_clear_holders_deps
  curtin_log.1438[1688]:     util.load_kernel_module('bcache')                       
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/util.py", line 330, in load_kernel_module
  curtin_log.1438[1688]:     subp(['modprobe', '--use-blacklist', module])           
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/util.py", line 266, in subp
  curtin_log.1438[1688]:     return _subp(*args, **kwargs)                           
  curtin_log.1438[1688]:   File "/snap/subiquity/664/lib/python3.6/site-packages/curtin/util.py", line 132, in _subp
  curtin_log.1438[1688]:     cmd=args)                                               
  curtin_log.1438[1688]: curtin.util.ProcessExecutionError: Unexpected error while running command.
  curtin_log.1438[1688]: Command: ['modprobe', '--use-blacklist', 'bcache']          
  curtin_log.1438[1688]: Exit code: 1

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