sudo dpkg --list 'linux-image*'

un  linux-image                               <none>                    <none>                    (no description available)
rc  linux-image-4.15.0-45-generic             4.15.0-45.48~16.04.1      amd64                     Signed kernel image generic
rc  linux-image-4.15.0-47-generic             4.15.0-47.50~16.04.1      amd64                     Signed kernel image generic
rc  linux-image-4.15.0-48-generic             4.15.0-48.51~16.04.1      amd64                     Signed kernel image generic
rc  linux-image-4.15.0-50-generic             4.15.0-50.54~16.04.1      amd64                     Signed kernel image generic
rc  linux-image-4.15.0-51-generic             4.15.0-51.55~16.04.1      amd64                     Signed kernel image generic
rc  linux-image-4.15.0-52-generic             4.15.0-52.56~16.04.1      amd64                     Signed kernel image generic
ii  linux-image-4.15.0-54-generic             4.15.0-54.58~16.04.1      amd64                     Signed kernel image generic
ii  linux-image-4.15.0-55-generic             4.15.0-55.60~16.04.2      amd64                     Signed kernel image generic
un  linux-image-4.15.0-58-generic             <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-45-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-47-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-48-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-50-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-51-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-52-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-54-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-55-generic    <none>                    <none>                    (no description available)
un  linux-image-unsigned-4.15.0-58-generic    <none>                    <none>                    (no description available)

sudo apt-get remove linux-image-4.15.0-58-generic
sudo apt-get purge linux-image-4.15.0-58-generic
sudo apt-get autoremove