$ dpkg -l |grep 'linux.*-image.*'
ii  linux-image-4.4.0-140-generic                               4.4.0-140.166   
                                      amd64        Linux kernel image for 
version 4.4.0 on 64 bit x86 SMP
ii  linux-image-4.4.0-141-generic                               4.4.0-141.167   
                                      amd64        Linux kernel image for 
version 4.4.0 on 64 bit x86 SMP
ii  linux-image-4.4.0-142-generic                               4.4.0-142.168   
                                      amd64        Linux kernel image for 
version 4.4.0 on 64 bit x86 SMP
ii  linux-image-4.4.0-143-generic                               4.4.0-143.169   
                                      amd64        Signed kernel image generic
ii  linux-image-extra-4.4.0-140-generic                         4.4.0-140.166   
                                      amd64        Linux kernel extra modules 
for version 4.4.0 on 64 bit x86 SMP
ii  linux-image-extra-4.4.0-141-generic                         4.4.0-141.167   
                                      amd64        Linux kernel extra modules 
for version 4.4.0 on 64 bit x86 SMP
ii  linux-image-extra-4.4.0-142-generic                         4.4.0-142.168   
                                      amd64        Linux kernel extra modules 
for version 4.4.0 on 64 bit x86 SMP
ii  linux-image-generic                                         4.4.0.143.150   
                                      amd64        Generic Linux kernel image
ii  linux-signed-image-4.4.0-140-generic                        4.4.0-140.166   
                                      amd64        Signed kernel image generic
ii  linux-signed-image-4.4.0-141-generic                        4.4.0-141.167   
                                      amd64        Signed kernel image generic
ii  linux-signed-image-4.4.0-142-generic                        4.4.0-142.168   
                                      amd64        Signed kernel image generic
ii  linux-signed-image-generic                                  4.4.0.142.148   
                                      amd64        Signed Generic Linux kernel 
image
jarnos@jarno-hp8510w:~/.init$ uname -r
4.4.0-143-generic


** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1764794

Title:
  signing: only install a signed kernel

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  We should switch the default kernel install to the signed kernel.
  This makes it much harder to uninstall the signed kernel in
  environments which enforce the kernel to be signed.  Boot loaders
  which can understand and validate it want the signed image, those
  which do not should ignore the appended signature.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1764794/+subscriptions

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