Update prepare task in Queued status: failed to self-update: /usr/local/solus/bin/installer no such file or directory

Symptoms 

• Update preparation task got hung - it is just loading at SolusIO > System Updates
• The task prepare installer for version update at SolusIO > Tasks is in Queued status
• There is the following error in the logs /var/log/solus/installer.log:

  CONFIG_TEXT: time="2020-05-15 09:30:07" level=info msg="failed to self-update from \"http://installer.dev.solusvm.com/testing/1.1.10040/installer\": rename /usr/local/solus/bin/installer /usr/local/solus/bin/.installer.old: no such file or directory"
  time="2020-05-15 09:30:07" level=error msg="failed to self-update: rename /usr/local/solus/bin/installer /usr/local/solus/bin/.installer.old: no such file or directory"
  time="2020-05-15 09:30:12" level=info msg="going to restart after self-update"

• solus-update service is not running:

  # systemctl status solus-update
  ● solus-update.service - SOLUS IO update service
  Loaded: loaded (/etc/systemd/system/solus-update.service; enabled; vendor preset: enabled)
  Active: failed (Result: exit-code) since Tue 2020-05-19 04:40:09 UTC; 17s ago
  Process: 8150 ExecStart=/usr/local/solus/bin/installer -run-update-service (code=exited, status=203/EXEC)
  Process: 8148 ExecStartPre=/bin/chmod 640 /var/log/solus (code=exited, status=0/SUCCESS)
  Process: 8142 ExecStartPre=/bin/mkdir -p /var/log/solus (code=exited, status=0/SUCCESS)
  Main PID: 8150 (code=exited, status=203/EXEC)

Cause

The file /usr/local/solus/bin/installer is missing.

Resolution

1. Connect to SolusIO Master via SSH
2. Download the latest installer version and add execution permission to it:

   # wget install.solus.io/latest -O /usr/local/solus/bin/installer
   # chmod +x /usr/local/solus/bin/installer

3. Start solus-update service:

   # systemctl start solus-update

4. Wait for 3-5 minutes for all the related services to load