Question Install 6.0.0-RC1 gives error Duplicate entry 'com_'

I have the same problem with the version pkg_kunena_v6.0.0-RC1_2022-03-05.

I already tried to remove everything with phpmyadmin.

I have deleted all tables with _kunena_.
From the extensions table I deleted all entries with kunena.

But still I get the following error message:

JInstaller: :Install: SQL error Duplicate entry 'com_' for key 'PRIMARY'.
Extension installation aborted.
Install package: An error occurred while installing the extension: com_kunena_

What can be the reason for this?

PHP 7.4.28
MySQLi 5.7.37-0ubuntu0.18.04.1
Joomla! 4.1.0 Stable

Hello,

Remove the kunena entries in the table #__mail_templates

Thank you, I was able to install Kunene 6.0.2
However it is not functioning well

The dashboard shows 10 existing categories from the previous install.
However when I click to see the list of categories there are none listed. When I try to create a new category I get this error among several others.
1054 Unknown column 'parentid' in 'where clause'
The dashboard show 631 uses but when I click to view the list all it shows are errors


Can you offer any suggestions? Do you need more information?

Database collation check: The collation of your table fields are correct
        

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This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload:  

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
421	Forum	kunenamenu	view=home&defaultmenu=423	forum	No
424	Post a New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
422	All Topics	kunenamenu	view=category&layout=list&catid=0	forum/index	No
423	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
425	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
426	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
427	Profile	kunenamenu	view=user	forum/profile	No
428	Help	kunenamenu	view=misc	forum/help	No
429	Search	kunenamenu	view=search	forum/search	No
430	Forum	mainmenu	Itemid=421	kunena-2014-10-09	Yes
431	COMMUNITY FORUM	mainmenu	view=home&defaultmenu=421	equine-forum	No

Joomla default template details : cassiopeia | author: Joomla! Project | version: 1.0 | creationdate: February 2017

Kunena default template details : Aurelia | author: Kunena Team | version: 6.0.2 | creationdate: 2022-08-15

Kunena template params:

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DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
borderless	1
tooltips	1
SubjectLengthMessage	80
fullactions	1
quick	0
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayModule	1
displayBreadcrumb	1
displayAnnouncement	1
displayFooter	1
avatarPosition	left
formRecover	0
labels	0
whoisonlineName	default
avatarType	rounded
topicicontype	svg
fontawesome	0
socialshare	0
socialsharetag
socialtheme	classic
optional_username	0
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#48a348
editorType	ckeditor
Bold	1
Italic	1
Underline	1
Strike	1
Subscript	1
Superscript	1
RemoveFormat	1
BulletedList	1
NumberedList	1
Blockquote	1
JustifyLeft	1
JustifyCenter	1
JustifyRight	1
JustifyBlock	1
Link_Unlink	1
Image	1
Smiley	1
Confidential	1
Hidetext	1
Spoiler	1
Code	1
Ebay	1
Twitter	1
Instagram	1
Soundcloud	1
FontSize	1
TextColor	1
Maximize	1
Map	1
Video	1
editorButtons
nameskinckeditor
ckeditorcustomprefixconfigfile
avatarSizeX	40
avatarSizeY	90
avatarSizeXThumb	36
avatarSizeYThumb	36
avatarSizeXWelcome	72
avatarSizeYWelcome	72
avatarSizeXList	36
avatarSizeYList	36
avatarSizeXPost	144
avatarSizeYPost	144
avatarSizeXProfile	200
avatarSizeYProfile	200
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 6.0.2 | 2022-08-15 [ Git Repository ]
        | Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
boardOffline	0
enableRss	1
threadsPerPage	20
messagesPerPage	6
messagesPerPageSearch	15
showHistory	1
historyLimit	6
showNew	1
disableEmoticons	0
template	aurelia
showAnnouncement	1
avatarOnCategory	0
showChildCatIcon	1
rteWidth	450
rteHeight	300
enableForumJump	1
reportMsg	1
username	1
askEmail	0
showEmail	0
showUserStats	1
showKarma	1
userEdit	1
userEditTime	0
userEditTimeGrace	600
editMarkup	1
allowSubscriptions	1
subscriptionsChecked	1
allowFavorites	1
maxSig	300
regOnly	0
pubWrite	0
floodProtection	0
mailModerators	0
mailAdministrators	0
captcha	1
mailFull	1
allowAvatarUpload	1
allowAvatarGallery	1
avatarQuality	75
avatarSize	2048
imageHeight	800
imageWidth	800
imageSize	150
fileTypes	txt,rtf,pdf,zip,,tgz,
fileSize	120
showRanking	1
rankImages	1
userlistRows	30
userlistOnline	1
userlistAvatar	1
userlistPosts	1
userlistKarma	1
userlistEmail	0
userlistJoinDate	1
userlistLastVisitDate	1
userlistUserHits	1
latestCategory	0
showStats	1
showWhoIsOnline	1
showGenStats	1
showPopUserStats	1
popUserCount	5
showPopSubjectStats	1
popSubjectCount	5
showSpoilerTag	1
showVideoTag	1
showEbayTag	1
trimLongUrls	1
trimLongUrlsFront	40
trimLongUrlsBack	20
autoEmbedYoutube	1
autoEmbedEbay	1
ebayLanguageCode	en-us
sessionTimeOut	1800
highlightCode	0
rssType	topic
rssTimeLimit	month
rssLimit	100
rssIncludedCategories
rssExcludedCategories
rssSpecification	rss2.0
rssAllowHtml	1
rssAuthorFormat	name
rssAuthorInTitle	1
rssWordCount	0
rssOldTitles	1
rssCache	900
defaultPage	recent
defaultSort	asc
sef	1
showImgForGuest	1
showFileForGuest	1
pollNbOptions	4
pollAllowVoteOne	1
pollEnabled	1
popPollsCount	5
showPopPollStats	1
pollTimeBtVotes	00:15:00
pollNbVotesByUser	100
pollResultsUserslist	1
allowUserEditPoll	0
maxPersonalText	50
orderingSystem	mesid
postDateFormat	ago
postDateFormatHover	datetime
hideIp	1
imageTypes	jpg,jpeg,gif,png
checkMimeTypes	1
imageMimeTypes	image/jpeg,image/jpg,image/gif,image/png
imageQuality	50
thumbHeight	32
thumbWidth	32
hideUserProfileInfo	put_empty
boxGhostMessage	0
userDeleteMessage	0
latestCategoryIn	1
topicIcons	1
debug	0
catsAutoSubscribed	0
showBannedReason	0
showThankYou	1
showPopThankYouStats	1
popThanksCount	5
modSeeDeleted	0
bbcodeImgSecure	text
listCatShowModerators	1
lightbox	1
showListTime	720
showSessionType	2
showSessionStartTime	1800
userlistAllowed	1
userlistCountUsers	1
enableThreadedLayouts	0
categorySubscriptions	post
topicSubscriptions	every
pubProfile	1
thankYouMax	10
emailRecipientCount	0
emailRecipientPrivacy	bcc
captchaPostLimit	0
imageUpload	registered
fileUpload	registered
topicLayout	flat
timeToCreatePage	1
showImgFilesManageProfile	1
holdNewUsersPosts	0
holdGuestPosts	0
attachmentLimit	8
pickupCategory	0
articleDisplay	intro
sendEmails	1
fallbackEnglish	1
cache	1
cacheTime	60
ipTracking	1
rssFeedBurnerUrl
autoLink	1
accessComponent	1
statsLinkAllowed	1
superAdminUserlist	0
attachmentProtection	0
categoryIcons	1
avatarCrop	0
userReport	1
searchTime	365
teaser	0
ebayLanguage	0
ebayCertId
allowChangeSubject	1
maxLinks	6
readOnly	0
ratingEnabled	0
urlSubjectTopic	0
logModeration	0
attachStart	0
attachEnd	14
attachmentUtf8	1
autoEmbedSoundcloud	1
emailHeader	media/kunena/email/
userStatus	1
signature	1
personal	1
social	1
plainEmail	0
moderatorPermDelete	0
avatarTypes	gif,jpeg,jpg,png
smartLinking	0
defaultAvatar
defaultAvatarSmall	s_
quickReply	1
avatarEdit	0
activeMenuItem
mainMenuId
homeId
indexId
moderatorsId
topicListId
miscId
profileId
searchId
custom_id
avatarType	1
sefRedirect	1
allowEditPoll	1
useSystemEmails	0
autoEmbedInstagram	1
disableRe	0
email_sender_name
display_filename_attachment	0
new_users_prevent_post_url_images	0
minimal_user_posts_add_url_image	10
utmSource	0
emailHeaderSizeY	560
emailHeaderSizeX	560
moderator_id
profiler	0
pickup_category	0
emailHeadersizey	560
emailHeadersizex	560
board_title	Equine Info Exchange
board_offline	0
offline_message	The Forum is currently offline for maintenance. Check back soon!
enablerss	1
threads_per_page	60
messages_per_page	10
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	1
showannouncement	0
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
askemail	1
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	2048
imageheight	400
imagewidth	400
imagesize	3000
filetypes	txt,rtf,pdf,zip,,tgz,,docx,doc
filesize	3000
showranking	0
rankimages	0
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	0
showstats	0
showwhoisonline	0
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	year
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	0
rss_word_count	0
rss_old_titles	0
rss_cache	900
defaultpage	recent
default_sort	desc
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
allow_user_edit_poll	0
maxpersotext	50
ordering_system	mesid
post_dateformat	ago
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	100
thumbheight	200
thumbwidth	200
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	2
latestcategory_in	1
topicicons	1
catsautosubscribed	0
showbannedreason	0
showthankyou	1
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
listcat_show_moderators	0
show_list_time	-1
show_session_type	0
show_session_starttime	0
userlist_allowed	1
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
email_visible_address
captcha_post_limit	10
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	5
hold_guest_posts	1
attachment_limit	8
article_display	intro
send_emails	1
fallback_english	1
cache_time	300
ebay_affiliate_id	5337089937
iptracking	1
rss_feedburner_url
autolink	1
access_component	1
statslink_allowed	1
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	1
searchtime	365
ebay_language	0
ebay_api_key
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	1
max_links	15
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
google_map_api_key
attachment_utf8	1
autoembedsoundcloud	1
emailheader	/media/kunena/email/
user_status	1
plain_email	0
moderator_permdelete	0
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar
defaultavatarsmall	s_
stopforumspam_key	6c9h7aqzkngu2x
quickreply	1
avataredit	0
activemenuitem
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avatar_type	1
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allow_edit_poll	1
use_system_emails	0
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disable_re	0
recaptcha_publickey	6LfbKw4TAAAAAB6-DiKf-wjbQ5wnRBiVga6VdRld
recaptcha_privatekey	6LfbKw4TAAAAAIPfRTE9mDHXvg35QioBuRPapYpC
recaptcha_theme	white
keywords	0
userkeywords	0
userlist_name	1
usernamechange	0
version_check	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Enabled:  access=1  login=1  activity=1  avatar=1  profile=1  private=1  
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=1  
 Kunena - Kunena Enabled:  avatar=1  profile=1  

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-GB	English (United Kingdom)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None

It is not useful to ask a question on a existing Topic it is better to create a new question about your own problem.
But your question has been asked several times on the forum.
if you want to upgrade an existing site to joomla 4 then this is the best order.
"The correct steps, if you upgrade from Joomla 3.10 to Joomla 4.0 and Kunena 6.0:
1. Uninstall Kunena via the Joomla extension manager (it uninstall the Forum along whith the Kunena menu)
2. If there are other (custom) menu items that relate to your Kunena forum, remove all these menus and menu items
3. Upgrade Joomla 3.10 to 4.0
4. Install Kunena 6.0
5. Create the Kunena menu (click on this button in the Dashboard)
6. Publish the menu item created for you in your top-level/main menu.