diff --git a/Emby.Server.Implementations/Updates/InstallationManager.cs b/Emby.Server.Implementations/Updates/InstallationManager.cs
index 09a5a0dca8..2705e0628b 100644
--- a/Emby.Server.Implementations/Updates/InstallationManager.cs
+++ b/Emby.Server.Implementations/Updates/InstallationManager.cs
@@ -141,8 +141,7 @@ namespace Emby.Server.Implementations.Updates
 
             if (guid != Guid.Empty)
             {
-                var strGuid = guid.ToString("N", CultureInfo.InvariantCulture);
-                availablePackages = availablePackages.Where(x => x.guid.Equals(strGuid, StringComparison.OrdinalIgnoreCase));
+                availablePackages = availablePackages.Where(x => Guid.Parse(x.guid) == guid);
             }
 
             return availablePackages;
diff --git a/MediaBrowser.Api/PackageService.cs b/MediaBrowser.Api/PackageService.cs
index b0333eb9ce..afc3e026a8 100644
--- a/MediaBrowser.Api/PackageService.cs
+++ b/MediaBrowser.Api/PackageService.cs
@@ -136,10 +136,11 @@ namespace MediaBrowser.Api
         /// <returns>System.Object.</returns>
         public object Get(GetPackage request)
         {
-            var packages = _installationManager.GetAvailablePackages().Result;
-
-            var result = packages.FirstOrDefault(p => string.Equals(p.guid, request.AssemblyGuid ?? "none", StringComparison.OrdinalIgnoreCase))
-                         ?? packages.FirstOrDefault(p => p.name.Equals(request.Name, StringComparison.OrdinalIgnoreCase));
+            var packages = _installationManager.GetAvailablePackages().GetAwaiter().GetResult();
+            var result = _installationManager.FilterPackages(
+                packages,
+                request.Name,
+                string.IsNullOrEmpty(request.AssemblyGuid) ? default : Guid.Parse(request.AssemblyGuid)).FirstOrDefault();
 
             return ToOptimizedResult(result);
         }
@@ -184,7 +185,7 @@ namespace MediaBrowser.Api
             var package = _installationManager.GetCompatibleVersions(
                     packages,
                     request.Name,
-                    new Guid(request.AssemblyGuid),
+                    string.IsNullOrEmpty(request.AssemblyGuid) ? Guid.Empty : Guid.Parse(request.AssemblyGuid),
                     string.IsNullOrEmpty(request.Version) ? null : Version.Parse(request.Version),
                     request.UpdateClass).FirstOrDefault();
 
diff --git a/MediaBrowser.Api/UserLibrary/ItemsService.cs b/MediaBrowser.Api/UserLibrary/ItemsService.cs
index 81142b7289..c7b5051712 100644
--- a/MediaBrowser.Api/UserLibrary/ItemsService.cs
+++ b/MediaBrowser.Api/UserLibrary/ItemsService.cs
@@ -119,6 +119,7 @@ namespace MediaBrowser.Api.UserLibrary
 
             var result = new QueryResult<BaseItemDto>
             {
+                StartIndex = request.StartIndex.GetValueOrDefault(),
                 TotalRecordCount = itemsResult.TotalRecordCount,
                 Items = returnItems
             };
@@ -169,6 +170,7 @@ namespace MediaBrowser.Api.UserLibrary
 
             return new QueryResult<BaseItemDto>
             {
+                StartIndex = request.StartIndex.GetValueOrDefault(),
                 TotalRecordCount = result.TotalRecordCount,
                 Items = dtoList
             };
@@ -229,7 +231,8 @@ namespace MediaBrowser.Api.UserLibrary
                 return new QueryResult<BaseItem>
                 {
                     Items = Array.Empty<BaseItem>(),
-                    TotalRecordCount = 0
+                    TotalRecordCount = 0,
+                    StartIndex = 0
                 };
             }
 
@@ -242,7 +245,8 @@ namespace MediaBrowser.Api.UserLibrary
             return new QueryResult<BaseItem>
             {
                 Items = itemsArray,
-                TotalRecordCount = itemsArray.Length
+                TotalRecordCount = itemsArray.Length,
+                StartIndex = 0
             };
         }
 
diff --git a/MediaBrowser.Model/Querying/QueryResult.cs b/MediaBrowser.Model/Querying/QueryResult.cs
index c007a45d6e..221645afbf 100644
--- a/MediaBrowser.Model/Querying/QueryResult.cs
+++ b/MediaBrowser.Model/Querying/QueryResult.cs
@@ -17,6 +17,12 @@ namespace MediaBrowser.Model.Querying
         /// <value>The total record count.</value>
         public int TotalRecordCount { get; set; }
 
+        /// <summary>
+        /// The index of the first record in Items.
+        /// </summary>
+        /// <value>First record index.</value>
+        public int StartIndex { get; set; }
+
         public QueryResult()
         {
             Items = Array.Empty<T>();
diff --git a/deployment/ubuntu-package-x64/Dockerfile b/deployment/ubuntu-package-x64/Dockerfile
index 99022891bd..21a536e5ed 100644
--- a/deployment/ubuntu-package-x64/Dockerfile
+++ b/deployment/ubuntu-package-x64/Dockerfile
@@ -1,4 +1,4 @@
-FROM microsoft/dotnet:2.2-sdk-bionic
+FROM microsoft/dotnet:3.0-sdk-bionic
 # Docker build arguments
 ARG SOURCE_DIR=/jellyfin
 ARG PLATFORM_DIR=/jellyfin/deployment/ubuntu-package-x64