Preparing to unpack .../ubuntu-release-upgrader-gtk_1%3a0.220.4_all.deb ...
Unpacking ubuntu-release-upgrader-gtk (1:0.220.4) over (1:0.220.2) ...
dpkg: error processing archive /var/cache/apt/archives/ubuntu-release-upgrader-gtk_1%3a0.220.4_all.deb (--unpack):
 unable to securely remove '/usr/lib/ubuntu-release-upgrader/check-new-release-gtk.dpkg-new': Read-only file system
Preparing to unpack .../ubuntu-release-upgrader-core_1%3a0.220.4_all.deb ...
Unpacking ubuntu-release-upgrader-core (1:0.220.4) over (1:0.220.2) ...
dpkg: error processing archive /var/cache/apt/archives/ubuntu-release-upgrader-core_1%3a0.220.4_all.deb (--unpack):
 unable to securely remove '/usr/lib/ubuntu-release-upgrader/do-partial-upgrade.dpkg-new': Read-only file system