Public bug reported:

System hangs during boot with 4.4.0-45-generic if cryptab contains a
valid entry. Passphrase prompt never seen. Black screen with blinking
underscore in upper left corner. Repeated attempts to type passphrase
have no effect.

There are two workarounds:
1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually after boot completes
2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot and the system finishes booting

robert@kalymnos:~$ cat /etc/crypttab
spare2 UUID=498b08bb-5e6b-4ddf-8b37-e059665a34e6 none luks
robert@kalymnos:~$ grep mapper /etc/fstab
/dev/mapper/spare2                        /spare2     ext4 defaults 0 2

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Summary changed:

- Hang during boot 4.4.0-45-generic with /etc/cryptab . Boots fine  in 
4.4.0-42-generic.
+ Hang during boot 4.4.0-45-generic with /etc/crypttab. Boots fine in 
4.4.0-42-generic and older

** Description changed:

  System hangs during boot with 4.4.0-45-generic if cryptab contains a
  valid entry. Passphrase prompt never seen. Black screen with cursor in
  upper left corner. Attempts to type passphrase have no effect.
  
- There are two workarounds: 
+ There are two workarounds:
  1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually thereafter.
  2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot.

** Description changed:

  System hangs during boot with 4.4.0-45-generic if cryptab contains a
  valid entry. Passphrase prompt never seen. Black screen with cursor in
  upper left corner. Attempts to type passphrase have no effect.
  
  There are two workarounds:
  1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually thereafter.
  2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot.
+ 
+ robert@kalymnos:~$ cat /etc/crypttab 
+ spare2 UUID=498b08bb-5e6b-4ddf-8b37-e059665a34e6 none luks
+ robert@kalymnos:~$ grep mapper /etc/fstab 
+ /dev/mapper/spare2                        /spare2     ext4 defaults 0 2

** Description changed:

  System hangs during boot with 4.4.0-45-generic if cryptab contains a
  valid entry. Passphrase prompt never seen. Black screen with cursor in
  upper left corner. Attempts to type passphrase have no effect.
  
  There are two workarounds:
- 1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually thereafter.
- 2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot.
+ 1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually after boot completes
+ 2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot and the system finishes booting
  
- robert@kalymnos:~$ cat /etc/crypttab 
+ robert@kalymnos:~$ cat /etc/crypttab
  spare2 UUID=498b08bb-5e6b-4ddf-8b37-e059665a34e6 none luks
- robert@kalymnos:~$ grep mapper /etc/fstab 
+ robert@kalymnos:~$ grep mapper /etc/fstab
  /dev/mapper/spare2                        /spare2     ext4 defaults 0 2

** Description changed:

  System hangs during boot with 4.4.0-45-generic if cryptab contains a
- valid entry. Passphrase prompt never seen. Black screen with cursor in
- upper left corner. Attempts to type passphrase have no effect.
+ valid entry. Passphrase prompt never seen. Black screen with blinking
+ underscore in upper left corner. Repeated attempts to type passphrase
+ have no effect.
  
  There are two workarounds:
  1) Comment out line referring the encrypted partition in /etc/crypttab and 
/etc/fstab. Mount the partition manually after boot completes
  2) Boot in 4.4.0-42-generic which works as do earlier versions. i.e. the user 
provides passphrase at the prompt during boot and the system finishes booting
  
  robert@kalymnos:~$ cat /etc/crypttab
  spare2 UUID=498b08bb-5e6b-4ddf-8b37-e059665a34e6 none luks
  robert@kalymnos:~$ grep mapper /etc/fstab
  /dev/mapper/spare2                        /spare2     ext4 defaults 0 2

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https://bugs.launchpad.net/bugs/1640297

Title:
  Hang during boot 4.4.0-45-generic with /etc/crypttab. Boots fine in
  4.4.0-42-generic and older

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