Good day all

I am having trouble with installing packages with pacman

Firstly updating pacman with pacman -Syu updates correctly with no issues,

however when attempting to install sudo with pacman -S sudo responds with:

[root@cx-W55xEU /]# pacman -S sudo resolving dependencies... looking for conflicting packages... Packages (1) sudo-1.8.17.p1-1 Total Download Size: 0.90 MiB Total Installed Size: 3.73 MiB :: Proceed with installation? [Y/n] y error: could not open file: /etc/mtab: No such file or directory error: could not determine filesystem mount points error: failed to commit transaction (unexpected error) Errors occurred, no packages were upgraded. 

After reading up about this, I attempted to install the package filesystem with pacman -S filesystem which should solve the mtab issue.

[root@cx-W55xEU /]# pacman -S filesystem warning: filesystem-2015.09-1 is up to date -- reinstalling resolving dependencies... looking for conflicting packages... Packages (1) filesystem-2015.09-1 Total Installed Size: 0.01 MiB Net Upgrade Size: 0.00 MiB :: Proceed with installation? [Y/n] y (1/1) checking keys in keyring [####################################################] 100% error: GPGME error: Invalid crypto engine (1/1) checking package integrity [####################################################] 100% error: GPGME error: Invalid crypto engine error: filesystem: missing required signature :: File /var/cache/pacman/pkg/filesystem-2015.09-1-x86_64.pkg.tar.xz is corrupted (invalid or corrupted package (PGP signature)). Do you want to delete it? [Y/n] y error: failed to commit transaction (invalid or corrupted package (PGP signature)) Errors occurred, no packages were upgraded. 

After deleting, I reattempted to download the latest release and install that by pacman -S filesystem again:

[root@cx-W55xEU /]# pacman -S filesystem warning: filesystem-2015.09-1 is up to date -- reinstalling resolving dependencies... looking for conflicting packages... Packages (1) filesystem-2015.09-1 Total Download Size: 0.01 MiB Total Installed Size: 0.01 MiB Net Upgrade Size: 0.00 MiB :: Proceed with installation? [Y/n] error: could not open file: /etc/mtab: No such file or directory error: could not determine filesystem mount points error: failed to commit transaction (unexpected error) Errors occurred, no packages were upgraded. 

My /etc/mtab file is clean i.e. no contents

I came across an arch wiki page about mounts but not sure if I should create a symbolic link as specified to solve this issue.

Any suggestions?