buildbot worker version for old ubuntu

bionic.user

@@ -5,7 +5,7 @@
 package_update: true
 package_upgrade: false
 packages:
-  - buildbot-slave
+  - python3-pip
 
 # apt
 apt:
@@ -99,6 +99,7 @@ ca_certs:
 
 # post boot
 runcmd:
+  - [ pip3, install, 'buildbot-worker==2.6.0' ]
   - [ sudo, -u, buildbot, --, buildbot-worker, create-worker, 
     /var/lib/buildbot/workers/default, '--use-tls',
     'buildbot.bitmessage.org',

trusty.user

@@ -5,7 +5,7 @@
 package_update: true
 package_upgrade: false
 packages:
-  - buildbot-slave
+  - python-pip
   - python-setuptools
   - python-psutil
   - libssl-dev
@@ -111,6 +111,7 @@ write_files:
 
 # post boot
 runcmd:
+  - [ pip, install, 'buildbot-worker==2.6.0' ]
   - [ sudo, -u, buildbot, --, buildslave, create-slave, 
     /var/lib/buildbot/slaves/default, '--use-tls',
     'buildbot.bitmessage.org',

xenial.user

@@ -5,7 +5,7 @@
 package_update: true
 package_upgrade: false
 packages:
-  - buildbot-slave
+  - python-pip
   - python-setuptools
   - python-psutil
   - libssl-dev
@@ -116,6 +116,7 @@ write_files:
 
 # post boot
 runcmd:
+  - [ pip, install, 'buildbot-worker==2.6.0' ]
   - [ sudo, -u, buildbot, --, buildslave, create-slave, 
     /var/lib/buildbot/slaves/default, '--use-tls',
     'buildbot.bitmessage.org',