Problem unlinking the file /var/cache/apt/pkgcache.bin

Some index files failed to download. They have been ignored, or old ones used instead.

W: Problem unlinking the file /var/cache/apt/pkgcache.bin - RemoveCaches (30: Read-only file system)

W: Problem unlinking the file /var/cache/apt/srcpkgcache.bin - RemoveCaches (30: Read-only file system)

 sudo rm /var/lib/dpkg/lock

sudo dpkg --configure -a

sudo rm /var/lib/apt/lists/lock
sudo rm /var/cache/apt/archives/lock

sudo mount -o remount /dev/sda1

dpkg: error: unable to access the dpkg database directory /var/lib/dpkg: Read-only file system