[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1916610

Title:
  MAAS booting with ga-20.04 kernel results in nvme bcache device can't
  be registered

Status in MAAS:
  Expired
Status in linux package in Ubuntu:
  Expired

Bug description:
  [  274.743265] cloud-init[3738]:         Traceback (most recent call last):
  [  274.759256] cloud-init[3738]:           File 
"/curtin/curtin/commands/main.py", line 202, in main
  [  274.779262] cloud-init[3738]:             ret = args.func(args)
  [  274.795270] cloud-init[3738]:           File "/curtin/curtin/log.py", line 
97, in wrapper
  [  274.811254] cloud-init[3738]:             return log_time("TIMED %s: " % 
msg, func, *args, **kwargs)
  [  274.831256] cloud-init[3738]:           File "/curtin/curtin/log.py", line 
79, in log_time
  [  274.847264] cloud-init[3738]:             return func(*args, **kwargs)
  [  274.863256] cloud-init[3738]:           File 
"/curtin/curtin/commands/block_meta.py", line 111, in block_meta
  [  274.883256] cloud-init[3738]:             return meta_custom(args)
  [  274.899263] cloud-init[3738]:           File 
"/curtin/curtin/commands/block_meta.py", line 1911, in meta_custom
  [  274.919265] cloud-init[3738]:             handler(command, 
storage_config_dict)
  [  274.935255] cloud-init[3738]:           File 
"/curtin/curtin/commands/block_meta.py", line 1652, in bcache_handler
  [  274.955255] cloud-init[3738]:             bcache_dev = 
bcache.create_backing_device(backing_device, cache_device,
  [  274.975255] cloud-init[3738]:           File 
"/curtin/curtin/block/bcache.py", line 479, in create_backing_device
  [  274.995261] cloud-init[3738]:             
ensure_bcache_is_registered(backing_device, target_sysfs_path)
  [  275.015257] cloud-init[3738]:           File 
"/curtin/curtin/block/bcache.py", line 436, in ensure_bcache_is_registered
  [  275.035254] cloud-init[3738]:             raise RuntimeError("bcache 
device %s can't be registered" %
  [  275.055257] cloud-init[3738]:         RuntimeError: bcache device 
/dev/nvme1n1 can't be registered
  [  275.075255] cloud-init[3738]:         bcache device /dev/nvme1n1 can't be 
registered

  Full log of the boot/error:
  https://pastebin.canonical.com/p/ggNDCwCtGq/

  Booting with hwe-20.04 works.

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